By Plummer H. C. 1875
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Extra resources for An Introductory Treatise On Dynamical Astronomy
Even if the Sun’s motion along the ecliptic swept out equal arcs in equal intervals of time, the projection of these arcs onto the celestial equator, along which time is measured, would lead to unequal time segments owing to the mutual inclination between the equator and the ecliptic. It is for these reasons that the concept of a ﬁctitious mean Sun, whose position coincides with that of the true Sun at the vernal equinox and which moves with uniform speed along the celestial equator, is introduced.
To convert horizontal into equatorial coordinates you need only to change between the coordinate systems by clicking on the buttons of a planetarium software. Or you can use a coordinate converter/calculator, provided by some astronomical programs (Fig. ). Other Coordinate Systems Apart from the systems of coordinates referred to the horizon and to the equator, there are two other coordinate systems which are used in astronomy: ecliptic coordinates and galactic coordinates. com (Commercial) M.
Textbook on Spherical Astronomy. Cambridge University Press, Cambridge () Acknowledgement. I want to thank the following people, organisations and distributors: Herbert Raab (Astrometrica) for his support. The other authors of this book for the good cooperation, especially Dr. rer. nat. Oliver Montenbruck and Prof. Dr. Klaus-Peter Schroeder for their helpful hints. Mike Smithwick (Distant Suns), United Soft Media (Redshift), Bill J. Gray (Project Pluto/GUIDE), Patrick Chevalley (Cartes du Ciel/Sky Charts) and Dave Herald (OCCULT) for authorizations of software screenshots.