Multiple choice

The position of the sun is annually twice overhead in Singapore because of the

  1. rotation of the earth

  2. revoluion of the earth

  3. elliptical path of the earth's orbit

  4. parallelism of inclined axis of the earth

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Singapore lies at 1°N latitude, between the Tropic of Cancer and Tropic of Capricorn. The sun is directly overhead twice annually (approximately once each when the sun crosses the zenith going north and south) due to the parallelism of Earth's inclined axis - the tilt direction stays fixed as Earth orbits, causing different latitudes to face the sun directly at different times. Options A, B, and C don't explain this phenomenon.