This is a general purpose star object that can store any and all information
of interest from a star catalog, as well as due calcuations about it self for
apparent location at a particular place on earth, at a particular time.
Set the current (RA, Dec) coordinates of the SkyPoint, given pointers to its Ecliptic (Long, Lat) coordinates, and
to the current obliquity angle (the angle between the equator and ecliptic).