Heliocentric Julian Date calculation
not sure if this is the right forum to ask my questions but it does relate to my observations of eclipsing binaries. I am aware of several websites where Julian dates can be entered from which Heliocentric Julian Dates are then calculated but I want to do the calculation in a my own Excel spreadsheet.
Can anyone provide the relevant equations? The only input parameters as far as I can see would be JD and the object's RA and Dec.
Any advice would be much appreciated. Cheers,