In theory, when is the longest day on Earth?
Here’s three ansers for you: The longest calendar day on earth so far is 31st December 2005 which had 86401 seconds, which it shared with twenty three other dates since 1972. The longest solar day so far is the last one you experienced – because the Earth’s rotation is slowing. It was 86400.002 seconds long approximately – and slightly longer than the one before that. The longest day so far sunset to sunrise is six months long and is experienced near either pole every year.
