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Home >> Programming Projects >> Ruby Code for Calculating the Julian Day

Ruby Code for Calculating the Julian Day

 

Here is a quick ruby script which can be used for calculating the Julian day. You can either download it by clicking here or simply copy and paste it.

These calculations were taken from the book Astronomical Algorithms by Jean Meeus, pages 59-61. It's a good book to have a copy of if you're into math, programming, astronomy, or just science stuff in general.

 

# Begin Julian Day Calculation (Meeus Pages 59-61) vvvv t= Time.now #### #You can change these variables and calculate the JD for a specific date if you want. Be sure though that you compensate for #your time zone if changing the hour. y = t.gmtime.year m = t.gmtime.month d = t.gmtime.day + t.gmtime.hour/24.to_f + t.gmtime.min/1440.to_f + t.gmtime.sec/86400.to_f #### if m > 2 y=y m=m else y = y-1 m = m+12 end a = (y/100).to_int b = 2 - a + (a/4).to_int jd = (365.25 * (y+4716)).to_int + (30.6001 * (m+1)).to_int + d + b + -1524.5 # End Julian Day Calculation^^^^ puts jd

 

 

 

 

 

 

Home >> Programming Projects >> Ruby Code for Calculating the Julian Day