Heliocentric Julian Date calculation

Thu, 06/19/2014 - 05:10

Hi All,

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,



Thanks Gary,

I've used Lew Cook's spreadsheets, very useful but the details of calculations are hidden. I was contacted off-line by a colleague who provided his spreadsheet based on info in Astronomical Algorithms by Jean Meeus, so I think I have what I've been looking for. Cheers,