# A universal reference point [duplicate]

I would like to use a system of co-ordinates (x,y,z,t) based on a specific well known point. My original choice (the center of the universe in the big bang theory, Bigbang0), was wrong as the universe did not explode everything moved apart from everything else and is still doing so.

So I would like a reference position useful to an observer within at least 100,000 light years, and valid for 250,000 years. I will call it Bigref0 to remind me of my error.

From Bigref0 I would have a position - x y z.

The time value I would like to use as an origin is based on the following criteria.

1. The centers of the Sun and Earth are most closely aligned to the Bigref0.
2. The time point t0 should be the closest point within 256 tera (2 to the power 48) seconds or about 8 million years which provides a reasonable accuracy. I doubt we can do better than 1 part in 25,000 or +/- 2 to the power 15.

The questions are

1. When was/will be t0 ?
2. What is the distance (r0) to Bigref0 from the center of the Sun at time t0?
3. The x y z position of the Earth relative to the center of the Sun at time t0 ?
4. The accuracy/stability of the 5 values (t0,r0,x,y,z) ?

Example

The point in space time where the line through Earth and Sun is the closest to a line running from the Our Galactic center to the center of the local cluster.

• Here, have a look at this classic question: physics.stackexchange.com/questions/136860/…
– pela
Oct 28 '15 at 14:46
• There is no center of the Universe. There is a center of the observable (by us) Universe, and we are it. Any other observer in another galaxy is also in the center of their observable Universe. Now, as far as when, that is an interesting question... Oct 28 '15 at 21:06
• @Aabaakawad How can the time portion be interesting when the time requested is the time that the Sun and Earth's centers are aligned with the center of the Universe? Oct 28 '15 at 21:47
• @called2voyage oh, I thought this was the beginning time for the universe. Oct 28 '15 at 21:52