Julian Day

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Julian day

[′jül·yən ¦dā]
(astronomy)
The number of each day, as reckoned consecutively since the beginning of the present Julian period on January 1, 4713 B.C.; it is used primarily by astronomers to avoid confusion due to the use of different calendars at different times and places; the Julian day begins at noon, 12 hours later than the corresponding civil day.

Julian Day

(religion, spiritualism, and occult)

For simplifying certain kinds of calculations, it was found to be helpful to delete references to months and years, and simply number all days consecutively. Each such numbered day is referred to as a Julian Day (JD).

References in periodicals archive ?
The hours, minutes and seconds of Julian day numbers are given as a decimal for ease of subtraction, and these decimals are:
make it a tedious process) astronomers have adopted something called the Julian Day number, JD number, or simply JD.
The integral part gives the Julian day number and the fractional part gives the time of day since noon UT, i.