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Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation.
Topic 4 Motions of Earth, Moon, and Sun. Overview: without streetlights to dim and hide the moon and planets, most cultures of the past made calculations that predicted their motions. The moon especially became a major tool for timekeeping.
Performance Indicator 1.1. Explain complex phenomena, such as tides, variations in day length, solar insolation, apparent motion of the planets, and annual traverse of the constellations. Major Understanding: of 15 degrees per hour. To people on Earth, this turning of the planet makes it seem as though the Sun, the moon, and the stars are moving .
1. The Earth Rotates About Its Axis. The Earth has a circumference (distance around at the Equator) of approximately 40,075 km (24,901 mi) The Earth rotates on its axis relative to the Sun in one "mean solar day" It rotates exactly 360° in one "Mean Sidereal Day" which is 86,164.0909 seconds, or 23 hrs 56 min 4.0909 seconds.
MOTIONS OF THE EARTH. As you know that the earth has two types of motions, namely rotation and revolution. Rotation is the movement of the earth on its axis. The movement of the earth around the sun in a fixed path or orbit is called Revolution.
Imagine a line passing through the center of Earth that goes through both the North Pole and the South Pole. This imaginary line is called an axis. Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation.
Earth’s Motions. What evidence do we have to provide evidence of Earth’s motions and how do calculate its elliptical orbit? Rotation - the movement of an object in a circular motion around a line of axis. Period of Rotation - amount of time to make one complete rotation. Example: Earth rotates 360o in 24 hours. Earth’s Rotation.
