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Motions of the Earth - Indian Geography, UPSC IAS Examination Video Lecture | Geography (Prelims) by Valor Academy
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FAQs on Motions of the Earth - Indian Geography, UPSC IAS Examination Video Lecture - Geography (Prelims) by Valor Academy
| 1. What are the different motions of the Earth? |  |
Ans. The Earth has three main motions: rotation, revolution, and precession. Rotation refers to the spinning of the Earth on its axis, which takes approximately 24 hours and causes day and night. Revolution refers to the Earth's movement around the Sun, which takes approximately 365.25 days and causes the change in seasons. Precession refers to the slow wobbling of the Earth's axis, which takes around 26,000 years and affects the position of the celestial poles.
| 2. How does the rotation of the Earth cause day and night? | |
Ans. The rotation of the Earth causes day and night because it creates the cycle of alternating sunlight and darkness. As the Earth rotates on its axis, different parts of the planet are exposed to the Sun's light. The side facing the Sun experiences daylight, while the side facing away from the Sun experiences darkness, resulting in day and night.
| 3. What is the significance of the Earth's revolution around the Sun? | |
Ans. The Earth's revolution around the Sun is significant because it determines the change in seasons. As the Earth moves in its elliptical orbit around the Sun, its tilt causes different parts of the planet to receive varying amounts of sunlight throughout the year. This variation in sunlight leads to the four seasons: spring, summer, autumn, and winter.
| 4. What is precession, and how does it affect the Earth? | |
Ans. Precession refers to the slow wobbling motion of the Earth's axis. It takes approximately 26,000 years for one complete precession cycle. This motion affects the Earth by gradually changing the orientation of its axis with respect to the stars. As a result, the positions of the celestial poles and the equinoxes shift over time.
| 5. How do the motions of the Earth impact our daily lives? | |
Ans. The motions of the Earth have several impacts on our daily lives. The rotation of the Earth causes the cycle of day and night, influencing our sleep patterns and daily activities. The revolution of the Earth around the Sun determines the change in seasons, affecting our clothing choices, agricultural practices, and overall climate. The precession of the Earth's axis has a long-term effect, altering the positions of the celestial poles and influencing the navigation and mapping systems based on celestial coordinates.
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