space cycles review. cycle # 1 day night day night
TRANSCRIPT
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Space CyclesReview
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Cycle # 1
Day Night Day Night
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We have day and night because the Earth ROTATES
• On it’s axis• Once every 24
¼ hours• ½ of the Earth
is illuminated (lit up) at a time
http://www.gcse.com/eb/day2.gif
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Cycle #2The length of days
Long Longer Longest Longer Long Short Shorter Shortest Short Shorter Shortest Long Longer
Longest
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The length of day changes during the year
• The number of hours of daylight is different at different times of the year
• The number of hours of daylight is different at different latitudes
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Summary
• Days are longer (more hours of daylight) in summer, shorter in winter
• There are greater differences in day length further away from the Equator
• There is not much change in day length near the Equator
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Summary
• Days get LONGER (more minutes of daylight each day) from the Winter Solstice to the Summer Solstice
• Days get SHORTER (fewer minutes of daylight each day) from the Summer Solstice to the Winter Solstice
• Day length is about EQUAL everywhere in the world on the Autumnal & Vernal Equinox
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Why does the length of day change?
• Because the Earth moves, or REVOLVES around the Sun
• This changes the way sunlight hits the Earth
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Cycle # 3The Seasons
Winter Spring Summer Fall Winter Spring Summer
http://www.getyourwebsitehere.com
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Seasons are caused by
• The tilt of the Earth
• The position of Earth in space
• The difference in direct and indirect light from the Sun
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Summary
• In winter:– Part of the Earth
is tilted AWAY from the Sun
– Part of the Earth gets INDIRECT energy from the Sun
• In summer– Part of the Earth
is tilted TOWARD the Sun
– Part of the Earth gets DIRECT energy from the Sun
The position of the Earth in space determines which part of the planet is tilted toward the Sun.
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Cycle # 4Moon Phases
New moon Waxing Crescent 1st Quarter Waxing Gibbous Full
Moon Waning Gibbous 3rd Quarter Waning Crescent New Moon
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The Moon
• A moon phase cycle (LUNAR CYCLE) lasts 29 1/2 days
• Moon phases are caused by the positions of the Moon, Sun, and Earth
• The moon also sees Earth phases
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http://www.astro.virginia.edu
What we see on Earth
compared to the position of the moon in
space
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DAY 1 The Moon's unilluminated (not lit by the Sun)
side is facing the Earth. The Moon is not visible.
New Moon
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DAY 3The Moon seems to be getting bigger –
more of the lit side is showing.
WAXING CRESCENT
Getting bigger:
WAXING
The RIGHT ½ of the
moon is lit
Less than ½ the moon showing:
CRESCENT
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FIRST QUARTER
DAY 7One-half of the Moon is illuminated by
direct sunlight.
One half of one half of the moon is
visible.
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Waxing Gibbous
DAY 11The Moon is more than one-half but not fully
illuminated by direct sunlight.
GIBBOUS: more than half of the moon is visible.
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Full Moon
DAY 14The Moon's illuminated side is facing the Earth.
The Moon is completelyilluminated by direct sunlight.
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Waning Gibbous
DAY 17The Moon is more than one-half but not fully
illuminated by direct sunlight.
Waning: getting smaller.
Moon is lit on the LEFT
side
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Last Quarter
DAY 22One-half of the Moon is illuminated
by direct sunlight.
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Waning Crescent
DAY 24The Moon is less than one-half illuminated by direct sunlight.
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Summary