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,

Mark

Herr_Alien

Affiliation

American Association of Variable Star Observers (AAVSO)

Thu, 06/19/2014 - 13:03

These two links should

These two links should help:

http://en.wikipedia.org/wiki/Heliocentric_Julian_Day

http://en.wikipedia.org/wiki/Position_of_the_Sun

You'll need the second link to compute the RA and DEC of the sun.

Mark Blackford

Thu, 06/19/2014 - 23:22

HJD

Thanks Alexandru,

I'll take a look at these. Cheers,

Mark

Gary Billings BGW

Thu, 06/19/2014 - 14:18

HJD spreadsheet

Here's one: I haven't used it myself...

www.lewcook.com/SUNTime.htm

Cheers, Gary Billings

Mark Blackford

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

Heliocentric Julian Date calculation

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