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At the first official council of the Christian Churches at Nicaea in 325 AD, the vernal equinox was fixed to a particular date (21 March) each year because Easter celebrations are based on the lunar calendar. Oxford: Oxford University Press, 2000 Anyway, eventually people noticed that "spring" actually started in late autumn weather.
However, they didn't adjust for celestial mechanics — the "tropical" year being a little slower that the solar year, due to the earth's "precession" (wabbling like a toy top) about its rotational axis (at 0.0003 radians per year), which amount to about a day every 130 years or, to be precise, one part of time in 26,000. So in 1582 AD Pope Gregorius XIII declared that the day after 4 October 1582 should be 15 October 1582, eliminating the 10 days to set the Vernal Equinox again at 21 March.
D (perhaps a divergance from the Roman Catholic Gregorian Calendar).
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The earth's axis of rotation slowly and steadily changes at a rate that (if held at its current value) would take some 21,000 years to complete a circuit (around a perpendicular through its orbital plane) with respect to the perihelion-to-aphelion axis. Since it would be difficult for everyone to adjust their watches an odd amount gradually during the year, we occassionally add a day to the last day in Feburary on a leap year .
Leroy Doggett's Calendars on Lyle Huber's web-page Wikipedia Toke Nrby and Calendarzone The Astronomical Almanac for the Year 2000 by the United States Government Printing Office. This happen about every four years, since: To adjust for that "little under" part, years divisible by 400 (e.g., 1700, 1800, 1900, 2100) are NOT leap years.