The reason there are 52 weeks in a year and not 48 weeks is because the concept of a month does not align perfectly with the concept of a week. While there are typically 4 weeks in a month, the number of days in a year (365) does not evenly divide by the number of days in a week (7). As a result, a year has on average 52.143 weeks, which is rounded down to 52 weeks [1].

Here is a breakdown of why there are 52 weeks in a year:

1. Calendar Year: A calendar year consists of 365 days, which is the standard length of a year in the modern calendar system [1].

2. Weeks in a Year Calculation: To calculate the number of weeks in a year, you divide the total number of days in a year (365) by the number of days in a week (7). The result is approximately 52.143 weeks [1].

3. Weeks as a Concept: Weeks are more of a mental construct than a physical measurement based on astronomical movements. Unlike days, months, and years, which have a basis in astronomical cycles, weeks are a human invention for organizing time [2].

4. International Standardization: The International Organization for Standardization (ISO) has established a standardized global calendar system called ISO 8601. According to this system, weeks are numbered from W01 to W53. The first week of the year always begins on a Monday, and the last week of the year can spill over into the following year [2].

5. Leap Years: Every four years, a leap year is added to the calendar to account for the extra time it takes for the Earth to orbit the sun. In a leap year, there are 366 days instead of the usual 365. This additional day affects the number of weeks in a year, resulting in 52.286 weeks [2].

Learn more:

1. How Many Weeks In A Year ? How to Calculate it Right
2. How Many Weeks in a Year? | CRM.org
3. How Many Weeks Are In a Year?