Activity 12.2 Let us explore (Pages 171-172) Shine light from the torch placed at some distance, say 1.5 metres, on the globe Class 7
hardActivity 12.2 Let us explore (Pages 171-172) Class 7
Shine light from the torch placed at some distance, say 1.5 metres, on the globe as shown in Fig. 12.4b (see in your textbook). Do you notice how half of the globe receives the light from the torch, while the other half stays dark? Class 7
Answer:
Yes, it is day time in that half of the globe which receives light, and night time in the other half.
Question 1.
What is the direction of rotation when light falls on the eastern part of India first? Class 7
Answer:
The light falls on the eastern part of India first when the globe rotates from West to East with respect to the North-South axis of the globe.
Observation and Conclusion: Sunrise occurs as our location moves into light and sunset occurs as it moves into darkness. The Earth's rotation from West to East causes the day-night cycle.
Question 2.
Since the Earth is rotating, shouldn't the stars also appear to move in the sky like the Sun? Class 7
Answer:
Yes! Because the Earth rotates, the stars seem to sweep across the night sky in long, graceful arcs - just like the Sun appears to move during the day.