Where are the rest of the 3 days are going if the earth is revolving around its own axis in 23 hours 56 minutes 4 seconds?

Question

Earth revolves around its own axis in approximately 23 hours 56 minutes 4 seconds. If we measure the length of a day by 24 hours we hour saving 180+56=234 seconds a day. In a year that is 234 * 365 = 85, 410 seconds. In 4 years that is 341,640 seconds. Now a say has 86400 seconds, so we are the end of 4 year we have 341,640/86400 = 3.95 days. But we add 1 day to February after 4 years. Why is this?

In: 2

Answer 1

At the same time we are revolving around The sun. So in 23h 56mins we have revolved around our own axis but actually to have sun at same spot we need to revolve slightly more, since we have revolved 1/365 around the sun.