Movatterモバイル変換
[0]ホーム
JULIAN DATE
The Julian Date (JD), or Julian Day Number, is a runningcount of days that starts at noon on January 1, 4713 BCE of theJulian Calendar. The date changes at noon, Greenwich (Universal)Time. It is widely used for astronomical observations,particularly for variable stars, so as to avoid calendricalconfusion and to allow for easy subtraction of dates. The US NavalObservatory has a fuller explanation and aconverter. TheAmerican Association of Variable StarObservers maintains annualJulianDate calendars.
[8]ページ先頭