a leap year has how many days
In the Julian calendar, the average (mean) length of a year is 365.25 days. In a non-leap year, there are 365 days, in a leap year there are 366 days. A leap year occurs every fourth year, or leap year, during which a leap day is intercalated into the month of February. For the Gregorian calendar the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days. The ISO standard ISO 80000-3, Annex C, supports the symbol a (for Latin annus) to represent a year of either 365 or 366 days. Nearly every four years is a leap year which has 366 days, as opposed to a common year, which has 365 in the Gregorian Calendar. Leap years have 366 days, not 365.We use leap years to sync our common years with the tropical years. As 218 out of every 900 years are leap years, the average (mean) length of this Julian year is 7002365242222200000♠365.2422222 days, which is closer to the length of the mean tropical year, 7002365242190000000♠365.24219 days, than is the Gregorian mean year, 365.242 5 days. 366 days.   In a normal year there are 365 days. In the leap year there are there are 29 days in February.   A leap year occurs every four years, except years divisible …by 100 but NOT 400. For example, 1700, 1800, and 1900 were NOT leap years. 1600 & 2000 WERE leap years. A calendar year is an approximation of the number of days of the Earth's orbital period as counted in a given calendar. The Gregorian, or modern, calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars; see below. February has 29 days in a leap year   Answer   February has 29 days during a leap year for the Gregorian calender instead of the regular 28.   Every year that is di…visible by four is a leap year. 2008/4 502 Leap year 2009/4 502.25 No leap year. Because 97 out of 400 years are leap years, the mean length of the Gregorian calendar year is 365.2425 days; this is within one ppm of the current length of the mean tropical year (365.24219 days) and even closer to the current March equinox year of 365.242374 days that it aims to match. Unlike a normal year a leap year is 366 days, due to the fact that a year is actually 365.25 days in a normal year so every time a year goes by it adds up, for example 365.25 adds to 365.50 then 365.75 then finally 366 then it repeats. During a leap year, February has 29 days instead of 28. A year is a leap year if it is divisible by 4, but century years are not leap years unless they are divisible by 400. So, the years 1700, 1800, and 1900 were not leap years, but the year 2000 was, which is why in a given 100 years, there are 24 leap years and 76 ordinary years. Why Do We Need Leap Years? The actual length of a year (the revolution of Earth around the Sun) is 365.2422 days. If we didn't have leap years, the seasons would shift about a quarter of a day every year, and after 100 years the seasons would be off by 25 days. The extra leap day adjusts this drift. it is divisible by 400.
366 days