## Gregorian calendar year

1 common year = 365 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

**1 common year = 365 (days/year) x 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) = 31536000 seconds.**

1 leap year = 366 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

**1 leap year = 366 (days/year) x 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) = 31622400 seconds.**

## Julian year

1 julian year = 365.25 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

**1 julian year = 365.25 (days/year) x 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) = 31557600 seconds.**

## Sidereal year

1 sidereal year = 365.25636 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

**1 sidereal year = 365.25636 (days/year) x 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) = 31558149,504 seconds.**

## Tropical year

1 tropical year = 365.242189 days

1 day = 24 hours

1 hour = 60 minutes

1 minute = 60 seconds

**1 Tropical year = 365.242189 (days/year) x 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) = 31556925,1296 seconds.**