Sun-Moon-Stars, Day-Night and Seasons

Our Solar System

The Sun, the Earth, the Moon and the planets form our solar system. The Sun is the star at the centre of the solar system, and it is a big ball of fire and gasses. The Sun is a star in the solar system, and it shines through its own light.

What are Planets?

The bodies that receive light from the stars are called Planets.

The Earth in the solar system receives light from the Sun; therefore it is called a Planet. Like Earth, Mars, Mercury, Jupiter, Saturn, Uranus, Venus and Neptune are also Planets. We have eight planets in our solar system. The Earth and other planets revolve around the Sun.

The Earth is round like a globe, and it revolves around the Sun on its inclined axis. The Earth takes 24 hours to rotate on its axis, and the Earth completes one revolution around the Sun in 365 days.

What are Satellites?

  • The bodies that revolve around the planets are called satellites.
  • Like planets, satellites receive their light from the Sun.
  • The Moon is the satellite of the Earth. It revolves around the Earth.
  • Similar to the Moon, other planets have satellites that revolve around them.

Day and Night: How do They Occur?

  • Day and night occur due to the rotation of the Earth on its axis.
  • Earth revolves around the Sun and takes 24 hours to complete one rotation on its axis.
  • The day occurs on that part of the Earth that faces the Sun. Similarly, the night appears on the other side.

When there is a day in one part of the Earth, there is night in other parts of the Earth. This is because the light from the Sun does not reach the other side of the Earth; therefore, night occurs there.

Seasons: How do They Occur?

The season cycle occurs due to the revolution of the Earth around the Sun. The Earth completes one revolution around the Sun in 365 days. There are seven days in a week, thirty days in a month and 365 days in one year.

  • During the revolution of the Earth around the Sun, the distance between the Sun and the Earth keeps changing.
  • The summer season and the hot season occur on that part of the Earth nearest to the Sun.
  • The other part of the Earth, far away from the Sun, remains cold.
  • There are six seasons in our country – Summer, winter, monsoon, autumn, spring and rainy.

As the distance between the Sun and the Earth increases and decreases, there is a difference in the temperature of the Earth. Due to the combination of these two, four more seasons (monsoon, autumn, spring and rainy) occur.

Frequently Asked Questions

How many planets are there in our solar system?

There are eight planets in our solar system.

List out the names of planets in our solar system.

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

How do day and night occur?

Day and night occur due to the revolution of the Earth around the Sun.

What are Stars?

The bodies that shine through their own light are called Stars.

What is a revolution?

The movement of the Earth around the Sun is called revolution.

Stay tuned to BYJU’S for more information on NIOS, syllabus, notes, along with its important questions and solutions.

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