UNIT 9THE EARTH, THE MOON

ANDTHE SUN

LESSON 1 THEY MOVE ! Earth is our planet and it is the third

planet from the sun. It rotates on its axis from the west to the

east. It takes 24 hours or one day to make

one complete rotation.

An axis is an imaginary line

that connects the North and South

Poles

The earth does not only rotate on its axis. It also moves around the Sun at the same time. It takes one year to move around the sound

The Moon also rotates on its axis. It takes about 28 days to make one complete rotation.

The Moon moves around the Earth. It also takes about 28 days to move around the Earth.

The sun is the centre of our solar system. The Earth and the Moon move around the Sun at the same time

Moon’s path around the Earth Earth’s path

around the Sun

The rotation of the Earth on its axis causes the length and position of a shadow to change.

The sun appears low in the early morning and late afternoon. This make the shadow longer in the early morning and late afternoon than at noon.

LESSON 2 DAY AND NIGHT The part of the Earth that is facing the Sun

experiences daytime. The part of the Earth that is facing away from

the Sun experiences night-time. Day and Night occur due to the rotation of the

Earth on its axis. Day and Night occur due to the rotation of the

Earth on its axis.

LESSON 3 PHASES OF THE MOON

The moon is the brightest object in the night

sky. It does not emit light. The Moon appears

bright at night because it reflects light from the

Sun to the Earth.

From the Earth, the Moon looks like it is

changing its shape. Actually it doesn’t. it is

caused by the different positions of the Moon

that we see from the Earth. This is called the

phases of the Moon.

There are four major phases of the Moon

PHASES OF THE MOON