I made the following program note in the middle of A drink for Father's Day on the Summer Solstice.
Normally, today is called "the longest day of the year." That isn't strictly true.I remembered! Now follow over the jump for videos from TomoNews US and HBO's Last Week Tonight about tonight's leap second.While we say longest “day” in regards to Sunday, the 24-hour period known as a day won’t be any longer.I'll see if I remember that factoid for the final entry of June.
The longest actual “day” or 24-hour period of the year will actually be June 30th, during the leap second. A full second has to be added to clocks to keep everything (atomic clocks, etc.) in synch with earth’s slowing rotation. That’s truly the longest “day” for a while.