From MoneyTalksNews: How many days are in a year? 365, of course, except when we add a leap day every four years.It takes Earth about 365.2422 days to revolve around the sun. So Julius Caesar rounded up to 365.25, or 365¼, says the U.S. Navy Observatory. Then he added one extra day to the 365-day calendar year every four years, because it took four years for that extra quarter of a day to add up to one full day.
The complete article is HERE -- along with "Leap Year Trivia: 11 Things You Didn't Know."
And here's a bonus twelfth thing you didn't know: When we began adding the extra day to straighten out our calendar, February 29 was known as "Light Extension Adding Phosphorescence Day." That was quite a mouthful -- until Emmett Lee Dickinson suggested that we shorten "Light Extension Adding Phosphorescence" to "LEAP" -- and now February 29 is referred to as "LEAP Day."
Dickinson wrote about LEAP Day in his now-classic poem, "Passed in our Rendezvous of Light" (below on the left). His poem inspired third cousin Emily to pen her poem, "Pass to thy Rendezvous of Light" (below on the right).
By Emmett Lee Dickinson:
Passed in our Rendezvous of Light,
Precise around the sun –
We slowly ford the Mystery
Which we have leaped by one!
By Emily Dickinson:
Pass to thy Rendezvous of Light,
Pangless except for us --
Who slowly for the Mystery
Which thou hast leaped across!