A leap second is an extra second that is added now and then to a day, to adjust for changes in the Earth's rotation. The second was originally defined as 1/86400 of a day, but according to the modern definition, the second has a fixed duration, independent of the Earth's rotation.
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There are either 6,311,347,200 sec (48 leap years) or 6,311,433,600 sec (49 leap years) in 200 years.
There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.There are 30 days in September in a leap year.
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2013 is not a leap year.2012 is a leap year, and the next will be 2016. When there is a leap year, leap day is always on February 29.If 2013 was going to be a leap year February 29th would fall on a Friday.
2miles per sec