[time-nuts] Determination of the placement of the first pps
albertson.chris at gmail.com
Mon Jan 23 14:57:49 EST 2012
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 <hmurray at megapathdsl.net> 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
> It's caused by the Earth's orbit not being circular and the axis of rotation
> not being perpendicular to the orbit plane.
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