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).

In: 0

Answer 1

We officially “end the year” early, so that it is always at midnight.

After four years, the extra bits that we missed off have accumulated to be an entire day and we add that extra day on to the fourth year