Question

Which of the following can be used to measure time?

• A. Events of sunrise and sunset
• B. Occurrence of rainfall
• C. The duration between one new moon to the next
• D. Spotting of shooting star

Answer 1

Answer: (A), (C)

The correct options are
A

Events of sunrise and sunset

C

The duration between one new moon to the next

To measure time, we need an event that occurs periodically, i.e., something that happens after a fixed interval of time.
Within a reasonable error of measurement, sunrise and sunset are periodic events. Also new moon occurs periodically. Hence, these events can be used to measure time.