sun, moon, earth, how do they work together to help life survive? day and night
TRANSCRIPT
Sun, Moon, Earth,
How do they work together to help life survive? Day and
Night
Days and Years
• Astronomy
Days and Years
• Astronomy– Study of the moon, stars and
other objects in space.
Rotation
• Earth rotates counter clockwise into the sun’s light if you are looking down on the North pole (night and day).
Rotation
• Earth rotates counter clockwise into the sun’s light if you are looking down on the North pole (night and day).
• Axis: 23½º (tilt)
Rotation
• Earth rotates counter clockwise into the sun’s light if you are looking down on the North pole (night and day).
• Axis: 23½º (tilt)–Imaginary line that passes
through Earth’s center at the N & S Poles.
Earth’s Rotation• At the equator the Earth has a
circumference of 40,070 km.
Earth’s Rotation• At the equator the Earth has a
circumference of 40,070 km.
• Rotates once in 24 hours.
Earth’s Rotation• At the equator the Earth has a
circumference of 40,070 km.
• Rotates once in 24 hours.
• This means that the speed
of the Earth at the equator is
1,670 km/hr (1,070 miles/hr).
Earth’s Rotation• At the equator the Earth has a
circumference of 40,070 km.
• Rotates once in 24 hours.
• This means that the speed
of the Earth at the equator is
1,670 km/hr (1,070 miles/hr).– At 45 degrees N and S
The speed is 1,180 km/hr.
Earth’s Rotation• At the equator the Earth has a
circumference of 40,070 km.
• Rotates once in 24 hours.
• This means that the speed
of the Earth at the equator is
1,670 km/hr (1,070 miles/hr).– At 45 degrees N and S
The speed is 1,180 km/hr.– Winston Salem, NC the
speed is about 1,367 km/hr.
Facts and Myths• The sun rises and sets.
Facts and Myths• The sun rises and sets.
– Myth
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.– Fact
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.– Fact
• The sun moves across the sky
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.– Fact
• The sun moves across the sky– Myth
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.– Fact
• The sun moves across the sky– Myth
• We spin under the light of the sun.
Facts and Myths• The sun rises and sets.
– Myth
• The Earth rotates in and out of the sun’s light.– Fact
• The sun moves across the sky– Myth
• We spin under the light of the sun. – Fact
Rotation vs. Revolution• Rotation is the spin of an object
about its axis.
Rotation vs. Revolution• Rotation is the spin of an object
about its axis.
–The Earth rotates once a day (once every 24 hours).
Rotation vs. Revolution• Rotation is the spin of an object
about its axis.
–The Earth rotates once a day (once every 24 hours).
• Revolution is the orbit of one object around another.
Rotation vs. Revolution• Rotation is the spin of an object
about its axis.–The Earth rotates once a day
(once every 24 hours).• Revolution is the orbit of one
object around another.–The Earth revolves around the
Sun every 365.26 days.
Day Night Cycle