Tag Archive


amateur astronomy awk bash b[e] supergiant cartoon conference convert evolved star exoplanet fedora figaro fits fun galaxy iraf large magellanic cloud latex linux lmc machine learning magellanic clouds massive star matplotlib meteor mypaper paper peblo photometry planet pro-am pyraf python red supergiant scisoft skinakas observatory small magellanic cloud smc spectroscopy starlink talk ubuntu university of crete video x-ray yellow hypergiant

Gregorian calendar date to Julian Date number

JD = (1461 x (Y + 4800 + (M – 14)/12))/4 + (367 x (M -2 -12 x ((M – 14)/12)))/12 – (3 x ((Y + 4900 + (M – 14)/12)/100))/4 + D – 32075

where JD=julian date number, Y=year, M=month, D=day of month
and valid for JD≥0, date after -4713 November 23.

source:
Cox A.N., “Allen’s Astrophysical Quantities”, New York, Springer-Verlag, 2000 (4rth ed.)