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Julian day is the continuous count of days since the beginning of the Julian period, used mainly by astronomers. Learn how to calculate the Julian date and its variants, such as reduced, modified, truncated, Dublin, CNES and CCSDS Julian days.
Learn how to convert dates between the Julian and Gregorian calendars using a visual example and a table of equivalent dates. The table covers the period from -500 to 2100 AD and shows the difference in days for each year.
The Julian calendar is a solar calendar of 365 days with a leap day every four years, proposed by Julius Caesar in 46 BC. It is still used for religious purposes in some parts of the world and differs from the Gregorian calendar by 13 days in the 20th century.
Learn about the calendar changes in Europe and the British Empire from Julian to Gregorian system, and the start-of-year adjustments from 25 March to 1 January. Find out how to use O.S. and N.S. notation for historical dates and events.
Zeller's congruence is an algorithm to calculate the day of the week for any Julian or Gregorian calendar date. It is based on the conversion between Julian day and the calendar date, and accounts for the variations in the days of the month and the years.
A Julian year is a unit of time defined as exactly 365.25 days of 86 400 SI seconds each. It is used in astronomy as a constant measure of duration, not a calendar year, and is different from the Julian day number.
Learn how to calculate the time of sunrise or sunset for any solar declination and latitude using the sunrise equation. Find the formulation, principles, expressions, and corrections for atmospheric refraction and solar diameter.
The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.