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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Mercury's highly eccentric, egg-shaped orbit takes the planet as close as 29 million miles (47 million kilometers) and as far as 43 million miles (70 million kilometers) from the Sun. It speeds around the Sun every 88 days, traveling through space at nearly 29 miles (47 kilometers) per second, fa...
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