| You are here: Almanahj Website ⇒ American curriculum ⇒ 5th Grade ⇒ Geology ⇒ Term 1 | ||
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Worksheet about Motions of Earth | ||
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| Subject: Geology | ||
| 5th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 147.6KB | ||
| Number of clicks: 143 | ||
| Publish date:November 28, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-09 04:00:44 | By: theodor Zahra Mohamed Ibrahim Abdallah | |
| File info: The Earth undergoes several motions, both rotation and revolution, which contribute to its dynamic behavior and various phenomena. Here are the key motions of the Earth: 1. Rotation: The Earth rotates on its axis, an imaginary line passing through the North and South Poles. This rotational motion is responsible for the cycle of day and night. The Earth completes one full rotation in approximately 24 hours, giving us the familiar 24-hour day. The rotation of the Earth also causes the apparent motion of celestial bodies across the sky. 2. Revolution: The Earth revolves around the Sun in an elliptical orbit. This motion is known as revolution and determines the length of a year. The Earth's orbit is not a perfect circle but rather an ellipse, with the Sun positioned at one of the foci. It takes approximately 365.25 days for the Earth to complete one revolution around the Sun, resulting in a leap year every four years to account for the extra quarter day. 3. Axial Precession: In addition to its rotation, the Earth experiences a slow, cyclic wobble in its rotational axis. This phenomenon is called axial precession or precession of the equinoxes. The Earth's axis traces out a circular path over a period of about 26,000 years. This motion causes the position of the celestial poles and the equinoxes to shift gradually over time. 4. Nutation: Nutation refers to small, irregular motions of the Earth's axis superimposed on the larger precession. It is caused by gravitational interactions between the Earth, Moon, and Sun. Nutation causes slight changes in the tilt and orientation of the Earth's axis, which affects the position of the celestial poles. 5. Orbital Eccentricity: Although the Earth's orbit is generally described as an ellipse, its eccentricity (deviation from a perfect circle) changes over time. This variation in orbital eccentricity occurs due to gravitational interactions with other planets in the solar system. It has a cyclical pattern with a period of approximately 100,000 years. These motions of the Earth have significant implications for various phenomena, including the changing seasons, the length of daylight hours, climate patterns, and the behavior of celestial bodies. They are fundamental to our understanding of timekeeping, navigation, and the study of astronomical events. | ||
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