The number of weeks in a year will depend on the type of calendar used.
One Year
=
52 Weeks
The number of weeks in a year will depend on the type of calendar used. The Gregorian year is commonly used worldwide and is either categorized into the normal or leap year. Other calendars include Julian year, Sidereal year and the tropical year. The number of weeks will differ in these types of year calendars depending on the days that make up a year.
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The Gregorian year calendar
The normal or common year calendar has 365 days. To determine the number of weeks in a year, we divide the number of days in that year by one week. This can be expressed as;
365 ÷ 7 = 52.143 weeks
Or
365 ÷ 7 = 52 weeks and 1 day
A leap year has 366 days, and we can divide this number by 7 to get how many weeks are in a leap year. This is expressed as;
366 ÷ 7 = 52.286 weeks
Or
366 ÷ 7 = 52 weeks and 2 days
Julian year
Although the Julian year is used in the astrological calculations, it was replaced by the Gregorian year calendar that is widely used today. One Julian calendar has 365.25 days. To determine the number of weeks in the Julian year, we divide by 7.
365.25 days ÷ 7 = 52.1785 weeks
It can also be expressed as;
365.25 days ÷ 7 = 52 weeks and 1 day
The Sidereal year
Astronomers often use the Sidereal year calendar as they tend to measure time by the largest fixed frame that they can find. One Sidereal year has 365.256 days. To determine the number of weeks that are in a Sidereal year, we divide this number by 7.
365.256 ÷ 7 = 52.179428 weeks
Or
365.256 ÷ 7 = 52 weeks and 1 day
The Tropical year
A tropical year is a time taken by Earth to complete a single rotation of the 4 seasons i.e. spring, summer, autumn, and winter. One tropical year has 365.2422 days. We divide the number of days in the tropical year by 7 to get the total number of weeks in the year. This can be expressed as;
365.2422 ÷ 7 = 52.17746 weeks
It can also be shown as;
365.2422 ÷ 7 = 52 weeks and 1 day
There will be 53 or 54 weeks in a calendar depending on the type of year. Although 52 weeks will always have complete days (7 days in a week), the last one or two weeks will be incomplete with a few days.