If we have an extra day added every 4 years, then how come we are not noticing it?

Question

If earth’s rotation is 365,25 days this means that the first year December 31st at 23:59 will look like an early afternoon; on year 2 it will look like noon and year 3 it will look like a morning (since we have 18 hours to spare).

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Answer 1

You do notice it. On February 29th every 4 years with some special considerations for century marks.