How many seconds are there in a calendar year, and how is it calculated?

The number of seconds in a calendar year depends on whether it’s a leap year or a non-leap year.

Here’s how it’s calculated:

For a Non-Leap Year (365 days):

1. There are 60 seconds in a minute.
2. Each hour has 60 minutes, making $60\times 60=3,600\text{seconds/hour}$.
3. A day has 24 hours, so 3,600×24=86,400 seconds/day
4. A non-leap year has 365 days:

86,400seconds/day×365days/year=31,536,000seconds/year.

For a Leap Year (366 days):

A leap year adds one extra day, so:

86,400seconds/day×366days/year=31,622,400seconds/year.

• A non-leap year has 31,536,000 seconds.
• A leap year has 31,622,400 seconds.

This calculation assumes standard 24-hour days without accounting for time zone changes or daylight saving adjustments.