What happened?
Don't call it a bonus day. But every leap year, we get a 29th day in February.
How we got here
Julius Caesar, "dealing with major seasonal drift" in Roman calendars, introduced the Julian calendar in 46 BCE, counting a year as 365.25 days and adding an extra day every four years, The Associated Press said. But a year is actually 365.242 days, so Pope Gregory XIII knocked out a leap year every hundred years — except years divisible by 400, like 2000. The 1582 Gregorian calendar "remains in use today" and, while its "gnarly math" is not perfect, it reduced "drift to mere seconds."
The commentary
"Without the leap years, after a few hundred years we will have summer in November" and Christmas in summer, said Younas Khan, a physics instructor at the University of Alabama at Birmingham. Some people treat Feb. 29 "as a free day" to do things "they've long been putting off," Phil Plait said at Scientific American. "I think that's a pretty good idea because, after all, catching up is what leap day is all about," astronomically speaking.
The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.
Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
What next?
There will be leap days every four years until the next skip year, 2100 — or till the Gregorian calendar is changed.
-
Political cartoons for November 29Cartoons Saturday's political cartoons include Kash Patel's travel perks, believing in Congress, and more
-
Nigel Farage: was he a teenage racist?Talking Point Farage’s denials have been ‘slippery’, but should claims from Reform leader’s schooldays be on the news agenda?
-
Pushing for peace: is Trump appeasing Moscow?In Depth European leaders succeeded in bringing themselves in from the cold and softening Moscow’s terms, but Kyiv still faces an unenviable choice
-
Blue Origin launches Mars probes in NASA debutSpeed Read The New Glenn rocket is carrying small twin spacecraft toward Mars as part of NASA’s Escapade mission
-
‘The Big Crunch’: why science is divided over the future of the universeThe Explainer New study upends the prevailing theory about dark matter and says it is weakening
-
Dinosaurs were thriving before asteroid, study findsSpeed Read The dinosaurs would not have gone extinct if not for the asteroid
-
The moon is rustingUnder the radar The Earth is likely to blame
-
Africa could become the next frontier for space programsThe Explainer China and the US are both working on space applications for Africa
-
NASA reveals ‘clearest sign of life’ on Mars yetSpeed Read The evidence came in the form of a rock sample collected on the planet
-
SpaceX breaks Starship losing streak in 10th testspeed read The Starship rocket's test flight was largely successful, deploying eight dummy satellites during its hour in space
-
Atoms into gold: alchemy's modern resurgenceUnder the radar The practice of alchemy has been attempted for thousands of years
