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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Star locations?
From: Andrés Ruiz
Date: 2014 Sep 16, 15:59 +0200
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Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
From: Andrés Ruiz
Date: 2014 Sep 16, 15:59 +0200
sidereal hour angle. Angular distance west of the vernal equinox; the arc of the celestial equator or the angle at the celestial pole between the hour circle of the vernal equinox and the hour circle of a point on the celestial sphere, measured westward from the hour circle of the equinox through 360°. Angular distance east of the vernal equinox, through 24 hours, is RIGHT ASCENSION. (BOWDITCH)
SHA = GHA - GHA_Aries
RA = 360-SHA [deg]
RA = RA/15 [h]
2014-09-16 15:26 GMT+02:00 Samuel L <NoReply_SamuelL@fer3.com>:
I've having a hard time in figuring out or understanding the Star SHA figure and what it means.
For example- Arcturus is 145d 55.2 min. with a declination of 19 d 6.6 min North.
What in the world does that mean? I assume it someway corresponds to RA and Dec (RA, of course is meaningless...to say it references off of Aries or the Spring equinox is even MORE meaningless as I would understand it better if were referenced off some real place like Greenwich).
Can someone please explain that stuff?
Thank you,
Sam Lohengrin
Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
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