the "Greenwich" meridian of the galaxy

[MC.STEEL]

So you probably know the general astronavigational eqivalents of east south north west is coreward rimward spinward and counterspinward this is nice for navigating but to be used to give coordinates is a different story. For how far you are from the center is easy i am say 56m AU from the galactic core but we need a central "meridian" so to say to be able to give a point of location.

And this makes me think the 1 meridian on earth is placed intentional to pass trough Greenwich so what will mark the first meridian in the galaxy:The first wise guys that sugjest it get the right to pick?Or it will just be the biggest star in the galaxy or maybe the home star of the biggest empire out there?The problem with these is that they probably wont live as long as the place itself and will constantly move.

I say the line between Andromeda or some other galaxy and the milky way be used

Btw sorry if it is hard to understand.

Edited February 17, 2014 by MC.STEEL

[Scotius]

Why complicate things? Stars circle the core of Galaxy at different speeds. Brightest of them also live very short. Line between center of the Galaxy and Sun should be a meridian 0. Of course it will move too, as Sun continues its orbit

[Winter Man]

We already have the Galactic Coordinate System which places the sun at the centre and 0 degrees towards the true centre. Until FTL travel is invented, there's really no need to have it any other way as here is our only reference point on the universe.

[Acidum]

...Of course it will move too, as Sun continues its orbit

So does Greenwich and Earth...

[Headhunter09]

So does Greenwich and Earth...

The difference is that points on the Earth don't move relative to Greenwich (same angular speed)

[Tex_NL]

The difference is that points on the Earth don't move relative to Greenwich (same angular speed)

Ever heard of plate tectonics?

The lithosphere is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary: convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.

[minerman30]

Ever heard of plate tectonics?

Alright, 99.9999% relative speed. Close enough.

[MC.STEEL]

We already have the Galactic Coordinate System which places the sun at the centre and 0 degrees towards the true centre. Until FTL travel is invented, there's really no need to have it any other way as here is our only reference point on the universe.

Yea i guess there is no need to change it until our galactic neighbours start nagging about Solcentrism