Wednesday, August 15, 2018 AD at 20:13:58   JD: 2458346.3430324

Enter a Date or Julian Number Above or Add/Subtract Days.

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Graphical representation of selected Julian Day.

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Graphical representation of selected Julian Day.
Display Ephemeris Data

Moon Phase Julian Calculator

Enter a date or julian number to see the phase of the moon associated with that date.

Julian day numbers are a useful tool for calculating dates. Basically, solar days are numbered sequncially from Monday, January 1, 4713 BC using, coincidentally, the Julian calendar. Nearly 2-1/2 million days have transpired since then.

Our calculator converts the Julian Day Number to standard dates of the Julian or Gregorian dating systems. Convention dictates that after 1582, when Pope Gregory made changes to the system established by Julius Caesar, the Gregorian Calendar is employed. The prolectic Julian calendar is used for all dates between 1582 and the beginning of time.

A Julian Day calculator can be used to easily find dates. For example, you make a contract covering exactly 120 days. You could mark off days on a calendar, but what if you needed to know the date 1200 days or more? Or suppose you want to know what day of the week you were born. All of the calculations become quite simple using this type of date converter.

World Map IDL

The appearance of the moon changes slightly based on where the observer is located. The map offers a few scattered locations across the globe remembering that the time given is that of Greenwich, England.

Babylonian Dates are based on the work of Richard A. Parker and Waldo H. Dubberstein entited "Babylonian Chronology 620 B.C. - A.D. 75"

Julian Day Calculator

Ephemeris for sun and moon data:

Moon Phase image

Peters vision

Moon Phase

Standard Dating info



Mesopotamian dates: 626 BC - 75 AD.

Julian Day Num - Std:

08/15/2018 AD
Year / Astronomical Year:
2018 AD / 2018
Sunset: nominally 6pm

All Systems:

Julian-Julian Day - Julian:
Julian-Julian Day Num:
Gregorian-Julian Day:
Gregorian-Julian Day Num:


Regnal Years of Hebrew Kings from 930 BC until 586 BC

On Thursday, October 4, 1582 Pope Gregory made minor changes to the Julian Calendar System in order to anchor the date of Easter in the perceived astrological sign of Aries. The day after Thursday, October 4, 1582 became Friday, 15 October 1582.