Convert to "Of Date" Apparent coordinates from "J2000" coordinates

[Philosophaie]

How do you convert to "Of Date" or "Apparent" coordinates from "J2000" coordinates?

The website:
http://ssd.jpl.nasa.gov/horizons.cgi#results
there are two options for displaying RA and DEC: Astrometric and Apparent. Astrometric is the J2000 coordinates and Apparent is the "Of Date".

http://www.ephemeris.com/goto.php
Just lists the Apparent

www.stellarium.org software
Lists both "Of Date" and J2000 coordinates.

My question is: Is there a formula to convert between the two coordinate systems?

 

[jim mcnamara]

Short answer - what are you trying to do? Can you write programs in some language like maybe C or FORTRAN?
I suppose you can use a sophisticated programmable TI calculator...
@D H probably can help with a lot more detail - the JPL has software that does astronomical calculations. And copes with Jxxxx. AFAIK.

Jan Meeus has several books meant for amateur astronomers. Please consider one of them as a great starting point.
Exmple: https://www.amazon.com/dp/0943396352/?tag=pfamazon01-20

As an aside - are you trying to project orbits of Solar System objects into the future? All of what I did was always okay with existing ephemera.