Difference (from prior major revision) (minor diff, author diff)

Removed: 1,2d0

Astrometry

Changed: 5c3

It is one of the oldest subfields of the science, dating back at least to Hipparcos, who compiled the first catalogue of stars visible to him and in doing so invented the brightness scale basically still in use today. In 1750, Simon Newcomb founded modern Astrometry.

It is one of the oldest subfields of the science, dating back at least to Hipparchus, who compiled the first catalogue of stars visible to him and in doing so invented the brightness scale basically still in use today. In 1750, Simon Newcomb founded modern Astrometry.

Changed: 7c5

Apart from the fundamental function of providing Astronomers with a reference frame to report their observations in, Astrometry is also fundamental for fields like [Celestial Mechanics]?, [Stellar Dynamics]? and Galactic Astronomy. It is also instrumental for keeping Time, in that UTC is basically the [Atomic Time]? synchronized to the Earth's rotation by means of exact observations.

Apart from the fundamental function of providing Astronomers with a reference frame to report their observations in, Astrometry is also fundamental for fields like [celestial mechanics]?, [stellar dynamics]? and [galactic astronomy]?. It is also instrumental for keeping time, in that UTC is basically the atomic time synchronized to the Earth's rotation by means of exact observations.

	Revision 3 . . (edit) July 28, 2001 2:16 am by Jmccann
	Revision 2 . . July 27, 2001 9:25 pm by Larry Sanger [Please make links and article titles lower case, just as you would in ordinary text]
	Revision 1 . . July 26, 2001 5:58 pm by (logged).142.231.xxx [Astrometry is the part of Astronomy that deals with positions and movements of celestial bodies]

History of Astrometry

Astrometry