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Heliocentric Julian Date calculation

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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,

Mark

Thu, 06/19/2014 - 23:43
HJD

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,

Mark