Julian day
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The Julian date (JD) is the interval of time in days and fractions of a day since January 1, 4713 BC Greenwich noon, Julian proleptic calendar.In precise work, the timescale, e.g., Terrestrial Time (TT) or Universal Time (UT), should be specified.The Julian day number (JDN)is the integral part of the Julian date (JD).The day commencing at the above-mentioned epoch is JDN 0. Negative values can be used for preceding dates, though they predate all recorded history. Now, at 15:38, Sunday November 22, 2009 (UTC) the Julian day number is 2455158.

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The Julian date (JD) is the interval of time in days and fractions of a day since January 1, 4713 BC Greenwich noon, Julian proleptic calendar.In precise work, the timescale, e.g., Terrestrial Time (TT) or Universal Time (UT), should be specified.The Julian day number (JDN)is the integral part of the Julian date (JD).The day commencing at the above-mentioned epoch is JDN 0. Negative values can be used for preceding dates, though they predate all recorded history. Now, at 15:38, Sunday November 22, 2009 (UTC) the Julian day number is 2455158.