jd – maravelias.info

Decimal fraction in Julian Date

grigoris April 18, 2013 June 17, 2015

Julian Day is a convenient way to count continuously days since the beginning of a specific time (noon of January 1, 4713 BC). This was proposed by Joseph Scaliger in 1583, as the beginning of the Julian Period, which epoch started when the three calendar cycles were together in their …

Astronomy

Gregorian calendar date to Julian Date number

grigoris February 17, 2012 June 24, 2015

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 …

Astronomy