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 this planet, has 52 weeks in a typical 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 isn’t a bissextile year, so it is going to have 52 weeks.
The Gregorian calendar was launched in 1582 by Pope Gregory XIII to right errors that had accrued 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, aside from years which are divisible by 100 however not by 400.
