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Movement of Earth Why do our seasons change?. Rotation V/S Revolution Rotation is the spinning of a moon or planet on its AXIS Revolution is planets movement.

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Presentation on theme: "Movement of Earth Why do our seasons change?. Rotation V/S Revolution Rotation is the spinning of a moon or planet on its AXIS Revolution is planets movement."— Presentation transcript:

1 Movement of Earth Why do our seasons change?

2 Rotation V/S Revolution Rotation is the spinning of a moon or planet on its AXIS Revolution is planets movement around a star or moons movement around a planet. Revolution is planets movement around a star or moons movement around a planet.

3 Rotation 24 hoursday Viewed from above our solar system, Earth Rotates once every 23 hours and 56 minutes. Because we are also revolving, from our perspective on Earth it rotates once every 24 hours, this is the length of our day. day and night Earth’s Rotation causes day and night. Our Moon rotates once (360 0 ) every 27 days, 8 hours 27.3 days

4 Revolution Revolution is a planets movement around a star or a moons movement around a planet. Revolution is a planets movement around a star or a moons movement around a planet. path of that planet or moon orbit The path of that planet or moon is called an orbit. Elliptical All planets in our solar system have an Elliptical orbit, (more oval than round)

5 Earth and Moon’s Revolution Our Moon’s revolution period is 27.3 days, this is why we see moon phases. Moon’s rotation and revolution periods are the same Because our Moon’s rotation and revolution periods are the same, we always see the same side of our Moon! Earth’s revolution period is days Earth’s revolution period is days

6 2. The tilt of our Earth The imaginary line that runs through Earth’s poles is called its axis. The imaginary line that runs through Earth’s poles is called its axis. Earths axis is tilted Earths axis is tilted

7 tilt of Earth Revolution around our Sun. 3. Seasons change due to the tilt of Earth and Revolution around our Sun. When either the northern or southern hemisphere receives more sunlight, the temperatures increase, when it receives less sunlight, the temperatures decrease. When either the northern or southern hemisphere receives more sunlight, the temperatures increase, when it receives less sunlight, the temperatures decrease. Less sunlight= WinterMore sunlight= Summer Less sunlight= WinterMore sunlight= Summer

8 4. Solstices and Equinoxes Winter Solstice December Winter Solstice occurs on December 21-22, we receive the shortest length of sunlight hours. Summer Solstice June Summer Solstice occurs on June 20-22, we receive the longest length of sunlight hours. Equinoxes equator12 hours 12 hours Equinoxes occur on March and on September 22-23, the equator receives 12 hours of light and 12 hours of darkness.

9 5. Apogee and Perigee When the moon is closest to Earth it is called Perigee When the moon is closest to Earth it is called Perigee When the moon is farther from Earth it is called Apogee When the moon is farther from Earth it is called Apogee

10 6. Aphelion and Perihelion When Earth is closest in orbit to the Sun is is called Perihelion, this is during our winter. When Earth is closest in orbit to the Sun is is called Perihelion, this is during our winter. When Earth is farthest in orbit from the Sun is is called Aphelion, this is during our summer. When Earth is farthest in orbit from the Sun is is called Aphelion, this is during our summer.


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