please assist me , i'm using Zet 9 and there is Geo longitude , Helio longitude and RA , what is the difference between them.
Mars Date Time HLng Lng RA 01.01.2000 0:00:00 359.12584 327.57547 330.14521
some books use geo long. and the RA interchangeably as if they are the same thing , but they are not.
please help , thanks in advance.