:: I agree with nearly all of what Steve writes above, and his figure of 365.256363004 days is correct for the sidereal year that he accurately describes, but the aim of our leap year system is not to match this " year ", or even to match the " mean tropical year " of 365.24219 days, but to match as closely as possible the average time between March equinoxes ( thus keeping the spring equinox in the northern hemisphere as close as possible to March 21st ), this " year " being approximately 365.2424 days, so we probably won't ever have to add the extra leap year that he mentions ."
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