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Since no such objects existed prior to October 4, 1957, all satellite-related MJDs are positive.
The Julian calendar was proclaimed by Julius Csar in 46 The Julian calendar differs from the Gregorian only in the determination of leap years, lacking the correction for years divisible by 100 and 400 in the Gregorian calendar.
In doing so, this implementation uses the convention that the year prior to year 1 is year 0.
compared to the actual solar tropical year of 365.24219878 days.
To use the page, your browser must support Java Script and you must not have disabled execution of that language. If the box above says “Your browser supports Java Script”, you're in business; simply enter a date in any of the boxes below and press the “Calculate” button to show that date in all of the other calendars.
The Gregorian calendar was proclaimed by Pope Gregory XIII and took effect in most Catholic states in 1582, in which October 4, 1582 of the Julian calendar was followed by October 15 in the new calendar, correcting for the accumulated discrepancy between the Julian calendar and the equinox as of that date.
Use Julian days and fractions (stored in 64 bit or longer floating point numbers) in your programs, and be ready for Y10K, Y100K, and Y1MM!
While any event in recorded human history can be written as a positive Julian day number, when working with contemporary events all those digits can be cumbersome.
The Hebrew (or Jewish) calendar attempts to simultaneously maintain alignment between the months and the seasons and synchronise months with the Moon—it is thus deemed a “”.