15 years at 365 days per year = 5475 days 5 years at 366 days per year = 1830 days 5475 + 1830 = 7305 days When they skip a leap year inbetween those 20 years, you get 7,304 days. When you skip a leap year and change it to every 5 years, you get 7,303 days. We do this because the length of the year is not actually 365.25 but actually 365.242 days.
There are 366 days in a leap year.
2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.2013 is not a leap year, so Christmas Day will not skip over Wednesday.
To keep the calendar correct. A year is not exactly 365.25 days
The leap year day pushes all the days after it for one year ahead an extra day.
Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.Because it is on a Wednesday. Normally a date advances by one day each year. In a leap year it advances by two days. Christmas Day was on a Sunday in 2011. Because 2012 was a leap year it jumped two days to Tuesday. 2013 is not a leap year, so it will move one day and be on Wednesday. It will Thursday in 2014, Friday in 2015 and because 2016 will be a leap year it will skip two days again and Christmas Day will be on a Sunday. In 2017 it will be a Monday, as 2017 is not a leap year.
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A normal year has 365 days; a leap year has 366 days.
365
If the last two digits of the year are divisible by 4, e.g. 1972, then you know it is a leap year. Century years (e.g. 2000) are only leap years if they are divisible by 400. Leap years occur because a year is not exactly 365 days, but around 365.25 days.
365 1/4 days in a year 365 and a quarter days every year, that's why we have a leap year every fourth year to round it up
When it is not a leap year, there are 31 days in December, as there are when it is a leap year.