This chapter explains the movements of the Earth, Moon, and Sun and how these motions affect life on Earth. It describes the rotation of the Earth, which causes day and night, and the revolution of the Earth around the Sun, which leads to changes in seasons and variation in the night sky during the year. The chapter also explains solar and lunar eclipses, showing how shadows are formed when the Sun, Earth, and Moon come in a straight line. Overall, the chapter helps us understand how celestial motions influence time, seasons, and natural events on Earth.
Key Points
The Earth rotates on its axis in about 24 hours.
Rotation of the Earth from West to East causes day and night.
The Sun appears to rise in the East and set in the West due to Earth’s rotation.
The Earth revolves around the Sun in about 365 days and 6 hours.
The path of revolution is called an orbit.
The tilt of the Earth’s axis and its spherical shape cause seasons.
Summer occurs when a hemisphere is tilted towards the Sun and receives longer sunlight.
Winter occurs when a hemisphere is tilted away from the Sun.
Equinox is when day and night are nearly equal.
Solstice marks the longest and shortest days of the year.
A solar eclipse occurs when the Moon comes between the Sun and Earth.
A lunar eclipse occurs when the Earth comes between the Sun and Moon.
Solar eclipses must never be viewed directly with naked eyes.
👉 👉The movements of the Earth, Moon, and Sun follow a perfect natural balance that controls time, seasons, and life on Earth. Understanding these motions helps us appreciate the order of nature, encourages scientific thinking, and removes fear and myths related to natural events like eclipses.