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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That is not how it works.
A year is how long it takes the earth to orbit around the sun and a day is how long it takes the earth to turn once around its own axis in respect tot eh sun.
A year is not an whole number of days.
It takes the earth about 365 days, 5 hours, 48 minutes and 45 seconds to obit once around the sun.
IF we always had a calendar with 365 days. The missing 5 hours and 48 minutes each year would add up over time and things like the beginning of spring would move around bit by tiny bit.
To make sure that the season happen each year around the same time we have to add a day about every 4 years.
The system as we have it now is so that the earth is not quite in the same place each January 1st, but due to the way we dd a leap day (almost) every four years it evens out.
One year the earth may be a quarter of a degree away from making a full circle and the next year that adds up to half a degree and then your have a leap year and you are ahead half a degree and then ahead a quarter of a degree and things don’t ever quite line up but they are close enough that nobody notices it much.
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