Are both correct? If only one is, which is it. Either way, why?
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The time to orbit changes from year to year. Sometimes it’s faster, sometimes it’s slower. Maybe we get pushed or pulled by Jupiter, maybe we fly a little closer to the sun when that happens. I’m sure the rate of change is following a trend, but I don’t know what. This is why we have leap years and leap days and leap seconds – our clocks are becoming ever more precise, and we are trying to keep our concept of a calendar in line with the orbital period of our planet, and it’s not perfect. When the Catholic Church switched from the Julian calendar to the Gregorian in 1582, the two had drifted so far apart a whole 10 calendar days basically didn’t happen during the switch – merely decreed on this day we’re switching calendars and the date will be X.
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