The variety of weeks in a yr can differ relying on the calendar system used. The Gregorian calendar, which is probably the most broadly used calendar on the planet, has 52 weeks in a regular yr and 53 weeks in a bissextile year. A bissextile year is a yr that’s divisible by 4 however not by 100, or a yr that’s divisible by 400. The yr 2025 will not be a bissextile year, so it’s going to have 52 weeks.
The Gregorian calendar was launched in 1582 by Pope Gregory XIII to right errors that had amassed within the Julian calendar, which was the calendar that was used beforehand. The Julian calendar had a bissextile year each 4 years, which triggered it to float out of sync with the photo voltaic yr. The Gregorian calendar corrects this by having a bissextile year each 4 years, apart from years which might be divisible by 100 however not by 400.
