How long is a year in 40k?

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**MrMerlin**

Well, I've been wondering how it works with the term "year" in 40, since the time it takes for a planet to rotate around its sun is quite different from planet to planet. So do they just use the 356 * 24 h day thing, or do they have their own time-measurments? I mean, wouldn't it miss the point of having 24 hours in a day when it only takes the planet 15 to rotate? So noon could be anything. Or how about having winter in July one year, summer the econd and the third year july is in spring?

So is a year a given amount of time or just the period of a planets circulation around its sun?

**Skycrawler**

I think the IoM has their own "standard" year based on Terra's time.

**lledwey**

For most things im pretty sure they use the Terran year as standard. Remember, most of what we read is written from the Imperium's viewpoint, so that is what we commonly see.

**whatwhat**

I would imagine planets would have their own system of time and the terran scale is used for the longer picture of things. Time dilation would make using the terran callender very difficult on some planets.

**Harriticus**

Everything is a Terran year.

**Botten3**

I would bet they go by the terran dating system

**Grey Templar**

They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

**whatwhat**

Grey Templar wrote:They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

So a planet that travels faster through space, and therefore experiences time at a slower pace than terra, still uses the Terran dating system for aging? That would be too confusing.

'How old are you jon?' 'Well I was only born yesterday but I'm already 25'

**Grenat**

Each planet surely uses its own time-scale alongiside the rather abstruse Imperial calendar. One for everyday usage the other for official/administrative usage.
There is some clues (but not full explanation) in the BRB p.126-127.

**Grey Templar**

whatwhat wrote:
Grey Templar wrote:They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

So a planet that travels faster through space, and therefore experiences time at a slower pace than terra, still uses the Terran dating system for aging? That would be too confusing.

'How old are you jon?' 'Well I was only born yesterday but I'm already 25'

the Human biological clock is based on Earth, therefore it only makes sense to use Earth's year as a standard. a human on Terra will age at, approximatly, the same rate as a human on the planet Xion which orbits its star once every 6 months.

In a Galaxy wide empire it makes sense to base all time on a planet of choice for the purposes of collecting taxes, measuring the passage of time, and organizing everything. Your home planet is a convienient and all around good choice, no one will have any issues with it as its completely logical.

**whatwhat**

Grey Templar wrote:
whatwhat wrote:
Grey Templar wrote:They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

So a planet that travels faster through space, and therefore experiences time at a slower pace than terra, still uses the Terran dating system for aging? That would be too confusing.

'How old are you jon?' 'Well I was only born yesterday but I'm already 25'

the Human biological clock is based on Earth, therefore it only makes sense to use Earth's year as a standard. a human on Terra will age at, approximatly, the same rate as a human on the planet Xion which orbits its star once every 6 months.

In a Galaxy wide empire it makes sense to base all time on a planet of choice for the purposes of collecting taxes, measuring the passage of time, and organizing everything. Your home planet is a convienient and all around good choice, no one will have any issues with it as its completely logical.

You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

**chyron**

whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

Poor kittens...nevermind.
For noticeable time dillation you'll need planetary system which moves at pretty high fraction of C relative to Solar System, but most stars in Milky Way move with speed ~220 kps (relative to Core), thus their maximum delta-V is less than 500 kps...which is 0.0017 C - negligible speed as far as time dilation concerned.
But even with much faster objects (in grimdark future everything is possible,oh yeah), it doesn't concern Imperial bureaucracy much - as if say Guard Regiment is raised from sub-c starsystem, it's men will still be aging at same speed as everybody else the moment they'll appear in "normal-speed" system. And tithing period is long.
Concerning historical reference - well, i don't remember is astropathic communications speed instant ,constant or random. In first case you can easily adjust your "planetary master clock" the way our PCs adjust time from time servers, in second it's only a bit more work as you'll need either chart or two reference point. In third case all things gets fuzzier...
Anyway, look at standart imperial dating format and read what first digit on the left means

**Grey Templar**

whatwhat wrote:
Grey Templar wrote:
whatwhat wrote:
Grey Templar wrote:They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

So a planet that travels faster through space, and therefore experiences time at a slower pace than terra, still uses the Terran dating system for aging? That would be too confusing.

'How old are you jon?' 'Well I was only born yesterday but I'm already 25'

the Human biological clock is based on Earth, therefore it only makes sense to use Earth's year as a standard. a human on Terra will age at, approximatly, the same rate as a human on the planet Xion which orbits its star once every 6 months.

In a Galaxy wide empire it makes sense to base all time on a planet of choice for the purposes of collecting taxes, measuring the passage of time, and organizing everything. Your home planet is a convienient and all around good choice, no one will have any issues with it as its completely logical.

You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

LOLWUT

Like chyron said, at the speeds a planet moves, Time Dialation is going to be negligable.

In fact, any sort of Time Dialation problems can be completely ignored by the Imperium as they don't travel accross the physical universe. instead they completely remove themselves from the continuity, travel through another reality, and then reemerge into the continuity. The only time issues they have is the fact that the 2 universes are on seperate time streams, meaning that any amount of time in one could be any amount of time in the other. in calm areas of the warp, it is stated that, on average ,1 day in the warp is equal to 3 outside. in turbulant areas it is anyones guess. you can even go back in time.

**Grakmar**

whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

**Psienesis**

whatwhat wrote:
Grey Templar wrote:They use Standard Terran years, which is our current year of 365.25 days.

other planets do have different planetary years, but they still use the Terran year for the passage of time.

a year on Nocturne, for example, lasts 15 Terran years. once every year, the Moon comes so close that it causes massive Tidal waves and Volcanic activity. the season of Fire. then, the dust from all the eruptions blots out the sun for the next 45 months and the season of Ice comes. the whole planet freezes. collectivly, this time is called the Time of Trial.

so an individual planet will use Terran years to count the age of its population and for the purpose of book keeping, but will also follow the planet's actual seasons.

So a planet that travels faster through space, and therefore experiences time at a slower pace than terra, still uses the Terran dating system for aging? That would be too confusing.

'How old are you jon?' 'Well I was only born yesterday but I'm already 25'

Yes, basically. Of course, anyone who's spent large amounts of time in space-travel could say the same thing, because of the time-shift effects of the Warp. You don't age in the Warp, and a journey that seems to take you two weeks may actually take a century to the rest of the Imperium. Or you may arrive at your destination before you left. It's the Warp, it's funny like that.

**KamikazeCanuck**

Grakmar wrote:
whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

Arrrgh! my brain!

**Brother_Khiros**

The BRB wrote:"The first digit [in the dating sequence] is the dating reference or check number. This check number is necessary due to temporal distortions which affect ships in Warp space as well as worlds which are remote, or isolated, from Earth."

Not the best explanation, but it gets the point across. If you read the entire exert on the Imperium's dating system, you should get a fairly good idea of how time works in the 40K universe, at least from Man's point of view.

**Brother Coa**

MrMerlin wrote:Well, I've been wondering how it works with the term "year" in 40, since the time it takes for a planet to rotate around its sun is quite different from planet to planet. So do they just use the 356 * 24 h day thing, or do they have their own time-measurments? I mean, wouldn't it miss the point of having 24 hours in a day when it only takes the planet 15 to rotate? So noon could be anything. Or how about having winter in July one year, summer the econd and the third year july is in spring?

So is a year a given amount of time or just the period of a planets circulation around its sun?

Imperial's ( and pretty much everybody else ) use old Earth day system ( 24 hours = day, 365 days = year ).

Automatically Appended Next Post:

KamikazeCanuck wrote:
Grakmar wrote:
whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

Arrrgh! my brain!

Were is Canadian 5'th to bring down heavy calculations?

**Grey Templar**

Brother Coa wrote:
MrMerlin wrote:Well, I've been wondering how it works with the term "year" in 40, since the time it takes for a planet to rotate around its sun is quite different from planet to planet. So do they just use the 356 * 24 h day thing, or do they have their own time-measurments? I mean, wouldn't it miss the point of having 24 hours in a day when it only takes the planet 15 to rotate? So noon could be anything. Or how about having winter in July one year, summer the econd and the third year july is in spring?

So is a year a given amount of time or just the period of a planets circulation around its sun?

Imperial's ( and pretty much everybody else ) use old Earth day system ( 24 hours = day, 365 days = year ).

Automatically Appended Next Post:

KamikazeCanuck wrote:
Grakmar wrote:
whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

Arrrgh! my brain!

Were is Canadian 5'th to bring down heavy calculations?

Who knows, but I think he would agree with this Calc.

BTW Coa: Holy only has 1 L, unless your location is supposed to be Holly(as in the decorative plant) Terra

**Psienesis**

Really, the only important part of an Imperial date you need to note is the part that says "MXX.". That's the only part that's going to be universally accurate. Everything else depends on whether or not the report is a first-hand recounting of the events, or is told second-hand, or third... or three-thousandth from a book copied by monks every century since the time of the Great Uprising or whatever other historical event the book is supposed to be relating.

Thus, though many Imperial dates are written "M41.787"... that is, by the statements given by GW, not supposed to be "The 787th year of the 41st millenium". It's... "The 41st Millenium... 7th check-ranking of relation to the events hereby categorized"... which is to say, the person telling you this information wasn't there, doesn't know anyone who was there, has never been to the planet mentioned in the piece, and couldn't point it out to you on a map with both arms and a flashlight.

**Brother Coa**

Grey Templar wrote:
Who knows, but I think he would agree with this Calc.

BTW Coa: Holy only has 1 L, unless your location is supposed to be Holly(as in the decorative plant) Terra

I know. I imagine when people ask about some x planet the other guy answer: "Orbit rate is 1.12 Earth days and year is around 250 days".
In short, we would use Earth time period for other planets. You can see that in almost every sci-fi. I guess it is same for Warhammer 40k.

**PrometheusZero**

Not only that but doesnt the Imperial dating system break each year into 1000 parts (just for administrative purposes)?

http://wh40k.lexicanum.com/wiki/Imperial_Dating_System

Yeah, everyone uses Terran years, in the same way the West uses Roman months because that's what the dominant religion proscribed!

**Grey Templar**

Yeah, each year is 1000 parts.

each 1/1000 of a year translates to roughly 1/3 of a day(.36525 to be precise)

Its the Check number which denotes the acccuracy of the date of whatever event is being recorded.

Full imperial date listing is as follows 0-123-456-M41

first number is the Check number, second set is the year fraction, 3rd is the year, last is the Millenium

Check Number accuracy is on that Lexi link.

**MrMerlin**

Brother Coa wrote:
MrMerlin wrote:Well, I've been wondering how it works with the term "year" in 40, since the time it takes for a planet to rotate around its sun is quite different from planet to planet. So do they just use the 356 * 24 h day thing, or do they have their own time-measurments? I mean, wouldn't it miss the point of having 24 hours in a day when it only takes the planet 15 to rotate? So noon could be anything. Or how about having winter in July one year, summer the econd and the third year july is in spring?

So is a year a given amount of time or just the period of a planets circulation around its sun?

Imperial's ( and pretty much everybody else ) use old Earth day system ( 24 hours = day, 365 days = year ).

Not sure about that...

Why should an ork tribe that doesnt even know about terra and thats only fighting tau know about earth time? On the other hand the 24H - 365 might work on every planet, but maybe on the desert planet kriff on hour equals 15 minutes. and if you have 24 h in a day, this adds up to a six hour day. So maybe they use this system, but it has ti be bent into shape

**whatwhat**

Grakmar wrote:
whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

Fair enough. I would suggest GW do too then. As in Flight of the Eisenstein Garro states he is the same age as Qruze despite having been born long after him, due to time dilation on his planet.

**Grey Templar**

whatwhat wrote:
Grakmar wrote:
whatwhat wrote:
You need to read up on time dilation. If a planet moves faster or slower through space the people on that planet will experience time at a different rate to those on earth. Meaning humans could age at a much faster or much slower rate than Terra.

It's not about how many times it rotates around it's sun it's about the speed at which a planet moves through space.

It's math time!

So, let's calculate how fast a planet must be moving to dilate time by 1%.

We start with the basic equation for time dilation: y = (1 - v^2/c^2)^-1/2. Solve that with y = 1.01 (for a 1% dilation) for v.
.980296049 = 1 - v^2/c^2
v^2 = 0.01970 * c^2
v= 0.14037c = 42000000 m/s

So, we've got a planet traveling at 42,000,000 meters every second. (For reference, the Earth is moving at 30,000 m/s).

For that planet to be in orbit around a star, it has to follow F = m*v^2/r. Where F is gravity and F=Gmm/r^2. So,
m1 * v^2 / are = G m1 *m2 / r^2
v^2 = G * m2 / r
m2 / are = 2.6 * 10^25 = 2,6000,000,000,000,000,000,000,000
m2 = 2.6*10^25 * r
"m2" is the mass of this planet's star, and "r" is the radius of it's rotation

We have two variables here, so there's plenty of numbers that can satisfy this. But, let's make some assumptions. Like, let's make this the most massive star in the Galaxy, to allow for the planet's radius to be as large as possible.

The most massive star is R136a1, with ~300 solar masses. That's 6*10^31 kg.

If we solve for r, we get 2.3 * 10^6 m for the distance of the planet's rotation. That's 2300 km.

Unfortunately, our Sun has a radius of 700,000 km. So, this planet would be well within the Sun it "orbits". Hell, 2300 km is a third of the Earth's radius.

Really, all this planet can be orbiting is a black hole, and even then, it won't be very far away from the event horizon. And, the planet itself would have to be rather small, not much more than an asteroid (that way part of it doesn't stick across the event horizon).

So, whatwhat, I suggest you really need to read up on time dilation. Because, it really isn't a factor in speeds as slow as planets.

Fair enough. I would suggest GW do too then. As in Flight of the Eisenstein Garro states he is the same age as Qruze despite having been born long after him, due to time dilation on his planet.

That bit bugged me to no end.

They really should have said it was due to time spent in the Warp. Qruze has spent more time in the warp, giving Garro the chance to age faster.