Noun
Julian day (plural Julian days)
A date expressed as a real number of days counted with GMT noon on 1 January 4713 BC in proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar) as zero; used primarily by astronomers and historians to compare events recorded in different cultures.
Adding one to the remainder after dividing by seven a date's Julian day number (JD modulo 7 + 1) yields that date's ISO 8601 day of the week, Richards, E. G. (2013). Source: Internet
And then Julian Day did the costume design on it. Source: Internet
An advantage of this method (used in the Julian Date system, in which a new Julian Day begins at noon) is that the date doesn't change during a single night's observing. Source: Internet
McCarthy & Guinot 2013, 91–2 The Julian date (JD) of any instant is the Julian day number for the preceding noon in Greenwich Mean Time plus the fraction of the day since that instant. Source: Internet
Other time scales Julian day number is a count of days elapsed since Greenwich mean noon on 1 January 4713 B.C., Julian proleptic calendar. Source: Internet
Julian dates are expressed as a Julian day number with a decimal fraction added. Source: Internet