If time is relative, then why are time based calculations based on Earth time?

Answer 1

well, because we can relate to it.
you can't base time on the sun because it appears stationary (so to speak)(actually we do base time off of the sun, only in relation to us though, not the rest of the galaxy)

it would seem a little silly to base time off of any other planets since we can't experience that time frame.

and we can't really base time on the speed of light. Its just to fast for humans to truly feel comfortable with.

plus. we've dealt with the idea of seconds minutes hours and such for a few thousand years. Its just second nature to us now.

I guess the point is we can relate to the "second" better than anything else.

Answer 2

True . Time is relative in the sense that it depends on the location in the Space structure of the Universe.At different location of the radius vector of the universe, time has different levels.

All measurements made by Science are all relative to the motion of the earth.

We measure time on earth by the number of oscilation that the earth makes relative to the Sun. Each oscilation of the Earth's eliptical orbit is called one Year. So time is measured in number of year in the local space of the Solar system.

Neverthe less the total time of the Universe is conserved.Time of the Universe is a constant.

Its very vely simple.

Answer 3

A lot of astronomical calculations are based on something called Barycentric Dynamical Time (TDB), which the time across the whole solar system. Because of gravity effects from the Sun and planets, TDB runs sometimes slower, sometimes faster than Earth time; but on average it runs at the same rate. The difference is less than plus or minus 2 milliseconds.

Answer 4

It has to be calculated relative to something, and since we all live on Earth, why not make all the calculations relative to Earth? More reasonable than making them relative to some distant galaxy, don't you think?

Answer 5

Astronomers measure time in many different ways. There's universal time (UT) which is based on earth time. There's Julian Dates, Heliocentric Julian Dates (time based on when light reaches the sun, instead of earth), orbital phases (1 orbital period = a phase of 1), and probably many others.

Answer 6

There are many ways of thinking about time. Earth-style measurements are for convenience's sake. Things like "time to get up for school," or "when does my plane get to Brussels" are measured in terms of earth coordinates.

"TIME!!!" in the larger sense, as thought of by astronomers, physicists, philosophers, and small dogs, is only indirectly related to clock time, and may or may not be measurable.

See if your library has a copy of Steven Hawkings's book _A Brief History of Time." Check it out and read it for some good insights.

Answer 7

Couple of reasons:
- we're the ones doing the calculations, we live on Earth, so we use Earth time
- there is no "universal" time we could use (we don't know what they use on Aldebaran 4 or Gliese 581C)

Answer 8

they have shows on television approximately that. each and all of the shoreland could be decrease than water. manhattan city sparkling over so some distance as Ohio. California could be not greater. Jacksonville Fl could be the coastline on the Gulf. tens of millions of persons could be with out residences as they be conscious of. If an Asteroid hit in the Alantic Ocean, Say see you later. All important fault lines come jointly in the Atlantic ocean which might set off worldwide Earthquakes and Volcano eruptions. Ect. we are all GONNA DIE! :)

Answer 9

Because we live on Earth, so it gives us something familiar to relate it to. If I told you it took 4 pluto years to get from point A to point B, would you have ANY clue how long it actually was?

Answer 10

You're mixing topics. Time (in the Einstein-ian Theory of Relatvity sense) has little or nothing to do with time-keeping... that activity we do with our watches and clocks.