Earth and Space: Lesson 1 Sun, Earth & Moon System
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4th Grade
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99 Slides • 23 Questions
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Earth and Space: Lesson 1 Sun, Earth & Moon System
Lesson 1-2
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The sun, Earth, and the moon form a system in space. This system is held together by gravity.
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Multiple Choice
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GRAVITY is a force that pulls objects toward each other.
(HIGHLIGHT) p.300
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Gravity pulls Earth toward the sun, holding Earth in orbit around it.
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Multiple Choice
An ______is the path that an object takes around another object in space.
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ORBIT
An orbit is the path that an object
takes around another object in space.
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REVOLUTION
Earth revolves, or travels around the sun.
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REVOLUTION
The movement of the Earth around the Sun in a fixed path is called a revolution.
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REVOLUTION
The Earth revolves from west to east.
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REVOLUTION
The Earth revolves from west to east.
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REVOLUTION
It takes Earth about 365 days to complete one revolution.
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REVOLUTION
It’s not exactly this simple though. An Earth year is actually about 365 days, plus approximately 6 hours.
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Multiple Choice
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MOON
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The moon is covered in craters, mountains, plains, and chunk of rock and dust.
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The moon appears to move across the sky because Earth is rotating on its axis.
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Multiple Choice
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MOON REVOLVES
While Earth revolves around the sun, the moon revolves around Earth.
(HIGHLIGHT) p.300
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MOON ROTATES
Like Earth, the moon also turns on its axis
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MOON'S ROTATION & REVOLUTION
The Moon takes about one month to orbit Earth (27.3 days to complete a revolution, but 29.5 days to change from New Moon to New Moon).
-NASA
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MOON'S ROTATION & REVOLUTION
It takes about a month for the moon to complete one rotation and to complete one revolution around Earth.
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Open Ended
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No. The Moon rotates on its own axis at the same rate that it orbits around Earth. That means we always see the same side of the Moon from our position on Earth.
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The side we don't see gets just as much light, so a more accurate name for that part of the Moon is the "far side."
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Multiple Choice
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The different shapes of the Moon that we see at different times of the month are called the Moon’s phases.
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Each phase of the moon has a different
shape. It takes about 1 month for the moon
to complete all of its phases. Then the cycle
repeats.
(29 1/2 days) new moon to moon
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Earth’s orbit around
the sun also has been used
to make calendars and tracktime. These are called SOLAR CALENDARS.
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The years in the Thai solar calendar are counted in Buddhist Era.
(543 years earlier than the Gregorian calendar)
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Aztec calendar is filled with ANIMALS and symbols marking important times of the year.
(Photo: Aztec's Year Symbols)
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For thousands of years, people used the phases of the moon to make calendars and track time. These are called LUNAR CALENDARS.
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Chinese calendar is based on 12-month and 12-year cycles.
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Each animal of the cycle comes once every 12 years.
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Multiple Choice
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Multiple Choice
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Modern (Gregorian) & Chinese Calendars
Both are divided into 12 cycles representing the phases of the moon.
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Why?
The new moon comes on different days each month, so the date that the Chinese New Year falls on will be different each year.
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Features of the Moon
no air or liquid water
craters, mountains and flat plains
revolves around Earth
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Phases of the Moon
First Quarter Moon
Full Moon
Third Quarter Moon
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HW
Pls. upload
pp.322-323
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Multiple Choice
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Open Ended
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The sun’s
gravity holds
the Earth-moon
system in place.
(HIGHLIGHT) p.300
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TIDES
Tides are the rise and fall of the surface levels of Earth’s ocean water caused by the gravitational effects of the Sun and Moon on Earth.
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TIDES
The effects of tides are most noticeable along ocean shorelines.
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SOLAR ECLIPSE
A solar eclipse happens when the Moon gets in the way of the Sun’s light and casts its shadow on Earth. That means during the day, the Moon moves over the Sun and it gets dark.
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Lunar Eclipse
During a lunar eclipse, Earth gets in the way of the Sun’s light hitting the Moon. That means that during the night, a full moon fades away as Earth’s shadow covers it up.
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p.301
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Earth and Space: Lesson 1 Sun, Earth & Moon System
Lesson 1-2
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