Short Answer 
A year is approximately 365.24 days, rounded to 365 days for calendar purposes, translating into about 52.14 weeks, with each year containing 52 full weeks plus 1 or 2 extra days. To organize this into a calendar, months are structured with varying lengths (30 or 31 days) and February is adjusted to 28 or 29 days in leap years, ensuring the total aligns with the yearly cycle.
Step 1: Understanding the Duration of a Year
A year is defined by the time it takes for Earth to complete one full orbit around the Sun, which is approximately 365.24 days. For practical purposes, this is usually rounded down to 365 days. This slight adjustment is important for organizing our calendar efficiently.
Step 2: Calculating Weeks in a Year
To find out how many weeks are in a year, we perform a simple calculation: 365 days divided by 7 days per week equals about 52.14 weeks. This means that each year contains 52 full weeks along with an additional 1 or 2 days depending on whether it’s a common year or a leap year.
Step 3: Organizing the Calendar
Our calendar is structured to distribute these 365 days into months. However, since 48 weeks (from 4 weeks per month multiplied by 12 months) only total 336 days, we need a better system. We achieve this by using a mix of months that have 30 and 31 days, with February having 28 or 29 days in leap years, thereby accommodating the remaining days to fit into our yearly cycle.