Stellarium

Equitorial cordinates of the moon not independant of location?

Asked by Shogan

I have a concern about the display of the RA/Dec (J2000) coordinates for the moon. When changing location latitude/longitude why are these coordinates changing?

The moon moves in time but with time paused these coordinates should not change with position on earth as equatorial coordinates are defined to be independent of position on earth.

Please see http://lcogt.net/spacebook/equatorial-coordinate-system/

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gzotti (georg-zotti) said : 		#1

All coordinates directly include topographic correction, of course this is most evident for the moon.

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Alexander Wolf (alexwolf) said : 		#2

Because Stellarium uses topocentric equatorial coordinates. And yes, almanacs uses geocentric equatorial coordinates + instruction for calculation of the topocentric equatorial coordinates.

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Shogan (shogan) said : 		#3

I'm sorry please excuse my confusion. But Alt/Azimuth coordinates are topocentric so that makes sense but I do not understand how you can produce topocentric equatorial coordinates? Perhaps you can enlighten me or provide a link?

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Launchpad Janitor (janitor) said : 		#4

This question was expired because it remained in the 'Open' state without activity for the last 15 days.