leapyear

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Why does February have 29 days?

February 29 is a date that usually occurs every four years, and is called leap day

  • This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit around the sun in precisely 365 days. 
  • The Gregorian calendar is a modification of the Julian calendar first used by the Romans.

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Early Roman Calendar

In 8th Century BCE, when the Romulus Calendar was used, there were only 10 months, with January and February missing. Each month had either 30 or 31 days.

Winter months weren’t counted as planters and harvesters didn't care for those unproductive, cold months, resulting in 61 days of non-calendared time, and years with only 304 days.

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Why Are There Only 28 Days in February?

mentalfloss.com

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