The Earth's rotation is always refferenced to a larger reference frame of distant stars, not the sun. If you try and use the Sun, I think there are smaller effects like the Earth and Moon revolve around a common center and then there is Jupiter. So they use stars. The next question is "which stars" and I think measurements are good enough that the question of "Which Stars?" matters. Makes sense when you remember that a nano second is about a foot and all stars are moving quite fast relative to each other.
On Mon, Jan 23, 2012 at 11:39 AM, Hal Murray <[email protected]> wrote: > >> Not to mention the solar noon varies by +/- 15min over the year (don't ask >> me how this is called...old knowledge from my high school days) > > Analemma: It's the figure 8 you see on globes in the middle of the Pacific > Ocean. > > It's caused by the Earth's orbit not being circular and the axis of rotation > not being perpendicular to the orbit plane. > > http://en.wikipedia.org/wiki/Analemma > > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
