Calculatin Sideral Timegreenspun.com : LUSENET : Astronomical_Calculations : One Thread
I am writing a java program that will calculate positions of solarplanets and display them graphically from the observers position. To do this I am using a book by Peter Duffett-Smith. In his book he has listed constants (A,B,C,D). Constant B is dependent on the year and is given up to year 2000. Can you possibly give a list of B constant for the next 5 years starting from 2001. I have managed to calculate position of the sun (Using horizon coordinates), but it has about 1.5 degrees error. I have used an estimate for B.
-- Thiam Balla Malamine (firstname.lastname@example.org), February 20, 2001
I personally use a simpler system for the siderial time based on the number of days from J2000.0 This method needs 'double precision' on your calculating device - I guess you are working with a computer based system and not a programmable calculator?
for the gory details. Duffett-Smith uses a similar method in the third edition of his excellent book.
-- Keith Burnett (email@example.com), February 24, 2001.