Question

1 mean solar day = _________

• A. 864000
• B. 86400
• C. 8640

Answer 1

The correct option is B

86400

1. The average of all solar days in which the earth completes one rotation on its axis is called the mean solar day.
2. The mean solar day is divided into twenty-four equal intervals and each interval is called an hour.
3. 1 day = 24 hour = 24 × 3600 seconds = 86400 sec
4. The period of time during which the earth makes one complete revolution on its axis relative to the sun.

Hence, 1 mean solar day = 86400 sec.