Answer the following questions: a) Full form of NASA? b) What revolves around the Sun? c) How long does it take Earth to rotate on its axis? d) Define Aphelion and Perihelion. e) How long does it take

Here are the answers to your questions, Kareng:

1. Answer the following questions:

a) The full form of NASA is National Aeronautics and Space Administration.

b) The Earth revolves around the Sun.

c) The Earth takes approximately 24 hours to rotate on its axis.

d) Aphelion is the point in the Earth's orbit when it is farthest from the Sun. Perihelion is the point in the Earth's orbit when it is closest to the Sun.

e) The Earth takes approximately 365.25 days (one year) to revolve around the Sun.

2. What is Diurnal motion? Write two of its effects.

Diurnal motion refers to the Earth's rotation on its own axis, which causes the apparent daily movement of celestial bodies across the sky.

Two effects of diurnal motion are:

• It causes the occurrence of day and night.
• It causes the apparent rising and setting of the Sun, Moon, and stars.

3. What is the Annual motion? Write two its effects.

Annual motion refers to the Earth's revolution around the Sun in an elliptical orbit.

Two effects of annual motion are:

• It causes the change of seasons.
• It causes variations in the length of day and night throughout the year.

4. Why does day and night differ at the same time in two different regions of the Earth?

Day and night differ at the same time in two different regions of the Earth because the Earth is a sphere and it rotates on its axis. As the Earth rotates, only one half of its surface is illuminated by the Sun at any given moment, experiencing day, while the other half remains in darkness, experiencing night. Due to its spherical shape, different longitudes are exposed to the Sun's light at different times, leading to varying times of day across the globe simultaneously.