[time-nuts] Determination of the placement of the first pps

Hal Murray hmurray at megapathdsl.net
Mon Jan 23 16:26:08 EST 2012


albertson.chris at gmail.com said:
> 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.

Astronomers use parallax from the Earth's orbit around the sun to measure 
angular distance to nearby stars.

Most of the things you see with a telescope are far enough away so that they appear fixed in the sky.  With a good telescope, most of them are likely to be galaxies.



-- 
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