How many days are in one year?

• A. 366 days
• B. 365 days
• C. 52 weeks
• D. 360 days

Answer: (B)

The length of a year comes from Earth’s orbit around the Sun, which takes about 365.2422 days. To keep the calendar roughly in sync with that orbital time, we use 365 days in a common year and add one extra day every four years, creating a leap year with 366 days. There are additional rules for century years: they are only leap years if divisible by 400. So, most years have 365 days, while a leap year has 366 days. The other options don’t fit the modern calendar: 52 weeks is 364 days, and 360 days is an older, rough number not used for the current year length. Therefore, the usual year length is 365 days.