Available Answers

1. 1.

   On which two days the Sun's rays are vertical on the Equator?

2. 2.

   Leap year occurs after how many years?

3. 3.

   What is circle of illumination?

4. 4.

   Why are seasons reversed between the Northern and the Southern Hemisphere?

5. 5.

   Why are days and nights are of unequal duration throughout the world?

6. 6.

   In summers days are longer than nights. Why?