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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.
Seismic waves are generated at a source, which can be natural, such as an earthquake, or artificial, such as an explosion. The resulting waves propagate through the me-dium, some portion of the earth, and are recorded at a receiver (Fig. 1.1-1).
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.
Earth’s Motions What evidence do we have to provide evidence of Earth’s motions and how do calculate its elliptical orbit? •
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 .
One cannot consider solar energy without becoming aware of the earth's motion, both its rotational motion about its own axis, and its orbital motion about the sun. These two modes of motion give rise to day and night, the number of hours of daylight, the angle of the sun in the sky, and the seasons.
