Julian Day Calendar

The Julian Calendar - Time and Date

The Julian calendar's predecessor, the Roman calendar, was a very complicated lunar calendar, based on the moon phases. ... It assigns a Julian Day (JD) to every year without having to worry about B.C.E or C.E. It was invented by French Scholar Joseph Justus Scaliger in 1583, who proposed that the Julian Period starts at noon on January 1, 4713 ...

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Julian Day Number from Date Calculator - High accuracy calculation

The Julian Day number is the number of days elapsed since noon (12:00) on January 1, 4713 BC The Modified Julian Day number is the number of days since midnight (00:00) on November 17, 1858 AD (MJD=JD-2400000.5) The Gregorian calendar is used for dates on and after October 15, 1582 AD and the Julian calendar is used before October 4, 1582.

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NASA LaRC Airborne Science Data for Atmospheric Composition

May 06, 2016 · The Calendar will be displayed in Regular and/or Julian Date Format . Compute JDay from Month / Day / Year* Select Month / Day / Year JDay value is then automatically displayed . Compute Month / Day from Year / JDay* (1) Select Year (2) Enter JDay value (3) Press the "To Month_Day" button

URL: https://www-air.larc.nasa.gov/tools/jday.htm Go Now