When a calendar month has two full moons, the second one is a monthly blue moon. That happens because the lunar month is only 29 days long, while the Gregorian calendar month is usually 30 or 31 ...

This year is a leap year, meaning Feb. 29 was added as the 366th day on the calendar. Here's what to know about its meaning, origin, deals and more.

In the Gregorian calendar, no century year can be a leap year unless it is exactly divisible by 400 - so 2000 was a leap year, with an extra day in February, but not 1900.

Friday the 13th may be considered unlucky, but it’s also more common than you might think. In fact, in the modern Gregorian calendar, it’s more likely that the 13th day in any month will be a ...

It didn’t work out. France switched back to the Gregorian calendar 12 years later. The Soviet Union tried its hand at a new calendar in 1929. The state shrunk the week to five days in a dual effort to ...

Vos Savant mentioned the Symmetry454 calendar, a perennial solar calendar that conserves the traditional seven-day week, has symmetrical, equal quarters, and starts every month on Monday.

Other calendrically financial problems are also generated by the Gregorian calendar. For example, back in 2012, Apple was caught up in a quarterly reporting fiasco. Following its Q4 2012 earnings ...

Wednesday marks the last day of February, the shortest month in the Gregorian calendar. It doesn’t have to be this way, according to some advocates who propose a calendar where every year is 13 ...

According to Richard Conn Henry 's calendar, eight months would each have 30 days. Every third month would have 31 days. Every so often, to account for the leftover time, a whole extra week would ...