VHS+Science+Lesson+06

Today we are going to learn about Earth, the sun, and the moon and how they move. (sunrise)

(sunset) Why does the sun rise and set? Where does the moon go during the day?



Earth moves around the sun, and the moon moves around Earth in a pattern. Their movements explain night and day, and the seasons.

It also explains to us how the moon looks to us and how eclipses happen.







= Earth, Sun, and Moon = Our Earth, moon, and sun are parts of the same system.



The relationship among them explains day and night, the seasons, and how the moon looks from Earth.

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Earth has alternating light and dark times. We call these times day and night.

When it is day on one side of the Earth, it is night on the other side.



Earth spins, or rotates, on its axis. Think of the axis as an imaginary stick. The axis goes straight through Earth. Earth rotates on it's axis every 24 hours. One day is equal to one complete turn of Earth on its axis.

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Part 2

= Seasons =



Earth revolves around the sun. We say it orbits the sun. It takes Earth one year to go all the way around the sun. People divide a year into 4 periods of time called seasons. Each season lasts a few months.

Just as the Earth revolves around the sun, the moon revolves around Earth.

media type="custom" key="26379734" Gravity causes the moon to orbit Earth.



The moon rotates and, like Earth, it has a morning and night. During the day the moon is hot. At night the moon is very cold because there is no atmosphere to keep it warm.

Sometimes the position of the moon makes it seem as though the sun has disappeared. Sometimes the position of Earth makes it seem as though the moon has disappeared.

However, the sun and moon do not really disappear. Instead, they are in shadows. The moon and Earth can both make shadows. These shadows are called eclipses.

Sometimes the moon comes between Earth and the sun. The moon partly blocks the sun. Earth gets darker because the moon blocks the sunlight. This is called a solar eclipse.



Sometimes Earth is between the moon and sun. At these times, Earth makes a shadow on the moon. This is a lunar eclipse. A little sunlight bands around Earth and reaches the moon. That little bit of light makes the moon look red.

http://youtu.be/49O2MsT1txU