Question 12 — On which periodic phenomenon - Questions at the end of the chapter - Chapter 11 Class 8 - Keeping Time with the Skies (Curiosity)

Last updated at July 13, 2026 by

Q 12
Question

On which periodic phenomenon are the following measures of time based: (i) day (ii) month (iii) year?

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Answer
Day: Earth's rotation; month: Moon's phases; year: Earth's orbit.

Explanation

Measure Based on
(i) Day The Earth's rotation on its axis (the Sun's daily cycle).
(ii) Month The Moon's cycle of phases (about 29.5 days).
(iii) Year The Earth's revolution around the Sun (cycle of seasons).
The day comes from Earth's rotation, the month from the Moon's phases, and the year from Earth's orbit.
← Back to concept: 11.2 How Did Calendars Come into Existence?
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