English: A graph of the time-and-date of the March equinox (a.k.a. northward equinox) in the Revised Julian calendar, computed (numerically integrated) in local apparent time in Jerusalem.

Caution: This graph shows the March equinox in an UNCOMMON calendar. The "Revised Julian calendar" is in-sync with the Gregorian calendar from March 1, 1600 through February 28, 2800, but creeps ahead of it thereafter. In 1923, some Eastern churches belatedly dropped the Julian calendar. Instead of adopting the Gregorian calendar (like almost everyone else), they reworked a Gregorian alternative that was first proposed in 1785, and adopted this "Revised Julian calendar", which allows only 2 of 9 whole-century leap-years (instead of 2 of 8 like the Gregorian), possibly because of better long-term accuracy than the Gregorian, and to keep the March equinox date centered on March 20 (like the old Julian) instead of mostly on March 21 (like the current Gregorian), and prevent dilemmas in calculating the date of [Eastern] Easter, from March 2800 onward.

Articles on solstices and equinoxes could benefit from graphs like this one, but those articles should [first] show a graph dated with the current Gregorian calendar, probably in another location (Prime Meridian and equator) and in mean solar time, and optionally show others such as Julian and this obscure "Revised Julian" for comparison.

Articles on calendars other than this obscure "Revised Julian" (Julian and Gregorian) should start with graphs dated to the corresponding calendar.

Articles on calendars (in general) that show the history of putting the calendar back in step with Earth's seasons and efforts to keep it there should show graphs of Julian and Gregorian first, and optionally this obscure "Revised Julian". By the time "Revised Julian" starts getting ahead of Gregorian (March 2800), one or the other might be revised to keep them in-sync, or they both might be revised to stay in-sync with Earth's seasons. The first uploaded version of this graph (see below) shows a big drift in the years 4400-10000.