Rotation and Revolution

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Welcome to Class Connect Make sure you are logged in under your student account:

Welcome to Class Connect Make sure you are logged in under your student account Joke of the day: What is an astronaut’s favorite meal? Type your answer in the chat box!

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What’s on the Agenda? Motion of the Earth, Sun and Moon Stars Phases of the Moon

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When the Earth, Sun, and Moon spin on their own axes, they are performing a motion called rotation . It takes one day, or 24 hours, for the Earth to make one complete rotation on its axis . The rotation of the Earth is responsible for the change between night and day . When one part of the Earth is rotated toward the Sun, it is daytime there. When the same part of Earth is rotated away from the Sun, it is nighttime there . The Sun and Moon appear to rise in the East and set in the West each day. At midday, the Sun appears to be almost directly overhead. But this apparent motion of the Sun and Moon is a result of the rotation of the Earth on its axis. The Sun also rotates on its axis. The Moon rotates on its axis as well. But we only ever see one side of the Moon, because it rotates at the same speed that it revolves around the Earth. Rotation

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When the Earth revolves , it moves in an orbit around the Sun. The orbit is elliptical , which means that it is similar to an oval in shape . The revolution of the Earth around the Sun and the tilt of Earth's axis are responsible for the changing seasons . It takes the Earth one year, or 365 1/4 days, to make one complete revolution around the Sun . The Moon orbits , or revolves around, the Earth, and it also revolves around the Sun as part of the Earth-Moon system . So the earth and moon REVOLVE, but the sun doesn’t Revolution

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Lets take a vote! Use your polling tool : Let’s boogie to a song about rotation and revolution! Let’s skip it!

Characteristics of Stars:

Characteristics of Stars Stars appear to move across the night sky because the Earth is rotating on its axis and also orbiting around the Sun. The stars stay in patterns because they do not move compared to one another . All stars are made up mostly of gases. Stars differ greatly in age, size, temperature, and color. Stars can take on a range of different colors including blue, orange, red, and yellow . Some stars appear brighter or dimmer from the Earth. A star might appear very bright because the star releases a large amount of light or it might appear very bright because it is very close to the Earth, or both. The Sun is only an average sized star, but it looks much brighter than other stars because it is much closer to the Earth than the other stars are.

Stars in the night sky:

Stars in the night sky The stars always appear in the same patterns. Some patterns of stars have names and are called constellations. To people on Earth, the patterns of stars appear to move from east to west across the sky during the night. This apparent motion is caused by the rotation of the Earth from west to east on its axis . The stars are not actually marching across the sky each night; the stars do not really rise and set. Instead, it would be better to say that the Earth has rotated so that different constellations can be seen.

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Every night the stars will appear more west than the night before. So, along with Earth's seasons, there are "seasons" of the stars visible from Earth. Each day, a few more stars are visible in the east that could not be seen the night before . The gradual cycling of the patterns of the stars through the year is due to the motion of the Earth around the Sun.

The Moon:

The Moon The Moon does not make its own light. It reflects light from the Sun. The Moon appears to move east to west. This happens because of the direction of the Earth's spin. As the Earth is spinning, the Moon is also moving around the Earth. This is why the Moon can sometimes be seen during the day and sometimes during the night. We see the same face of the Moon all the time. The Moon's appearance changes over the period of about a month as the Moon moves in its orbit around the Earth. The appearance of the Moon in a particular position in its orbit is called the phase of the Moon. The time between one new Moon and the next is about 29 1 / 2 days , which is about 4 weeks or one month. After the new Moon, the Moon appears to get larger each day for about two weeks until it is full. Then, the Moon appears to get smaller each day for two weeks until it is a new Moon again. During a new Moon, the Moon is still there in the sky, but it cannot be easily seen because it is in the dark.

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WAXES= GROWS WANES= SHRINKS

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Smile while I take your picture for attendance!

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LET’S HEAR MOBY AND ANNIE DISCUSS THE MOON!

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Buzz Lightyear invited Charlie to join him on a special space ranger mission. Let’s help Charlie complete his training by answering the following questions… He received this invitation in the mail!

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1. Which of the following statements correctly describes the appearance of stars ? Each night, stars travel across the sky from west to east. Spinning of the Earth on its axis causes the stars to look as if they are moving. All patterns of stars are visible only one night each year. Each pattern of stars can be seen all year round from the same place on Earth.

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2. Should you expect the stars that are visible on your birthday this year to be visible on your birthday next year ? Yes Only half the stars would be visible . Twice as many stars would be visible . no

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3. Which statement below is correct ? The Sun revolves around the Earth-Moon system . The Earth-Moon system revolves around the Sun . The Earth revolves around the Sun-Moon system . The Moon revolves around the Sun, but the Earth does not.

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Charlie is wondering which parts of the Sun-Earth-Moon system rotate . What should you tell Charlie? Only the Earth rotates . The Sun, Earth, and Moon rotate . Only the Sun and Earth rotate . Only the Moon rotates.

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We did it! Charlie regrets that he couldn’t send a video because he doesn’t get service in Planet Zurg , but he did send a postcard…

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To Infinity and Beyond!

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Before you leave today, remember to: Add 60 minutes to you science attendance Complete your Study Island assignment for this week Move yourself to a breakout room to play a game for 5 minutes!

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