Earth's Rotation
Rotate means ___________
spin
Revolve means__________
orbit
(a smaller object goes around a larger object)
How long does it take the moon to make 1 full revolution around the Earth?
27.3 days (about a month)
What does waxing mean?
Waxing: The moon is becoming more illuminated
Waning: The moon is becoming less illuminated
When the northern hemisphere has summer, the southern hemisphere has ___________.
winter
Earth rotates on its axis. The axis is tilted _____ degrees.
A. 5
B. 10
C. 23.5
D. 30
C. 23.5
What does Earth revolve around?
The sun (planets revolve around stars!)
Why do we always see the same side of the moon?
The moon rotates at the same speed as it revolves.
What is the difference between a crescent and gibbous moon?
Crescent: less that 50% illuminated
Gibbous: more than 50% illuminated
What 2 things cause Earth to have seasons?
- Earth is tilted: this causes seasons
- Earth revolves (orbits) around the sun: this causes seasons to change
What changes as Earth rotates on its axis?
Day & Night
What changes as Earth revolves around the sun?
Seasons change!
Is the moon tilted?
Yes, it is tilted 5 degrees
What moon phase occurs after a waxing gibbous moon?
Full moon
Which image shows the northern hemisphere has winter?
Image 4 because the northern hemisphere (top of Earth) is pointed away from the sun.
How long does it take the Earth to make 1 full rotation?
23 hours, 56 minutes (about 1 day)
How long does it take the Earth to make 1 full revolution?
365.25 days (about 1 year)
Why does the moon appear different to us as it revolves around the Earth? Fill in the blanks.
The______ of the Moon depends on the Moon's position relative to the Sun and Earth. We see different phases of the Moon because the sun shines light on _______ of the Moon at all times. This light coming from the Sun bounces off the Moon and is viewed on Earth as the bright part of the Moon. As the moon orbits the Earth, the amount of ___________ that we see changes each day.
The phase of the Moon depends on the Moon's position relative to the Sun and Earth. We see different phases of the Moon because the sun shines light on half of the Moon at all times. This light coming from the Sun bounces off the Moon and is viewed on Earth as the bright part of the Moon. As the moon orbits the Earth, the amount of illumination that we see changes each day.
What moon phase occurs between a crescent and a gibbous moon?
A quarter moon
Why aren't there seasons at the equator (O degrees latitude)?
The equator receives the same amount of sunlight throughout the year.