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30 terms

Moons, Tides, Eclipses, & Seasons

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How often does a lunar eclipse take place?
2 to 4 times per year
How many degrees is the earth tilted?
23.5 degrees
How long does it take the moon to orbit the earth?
28 to 29 days
How old is the Earth?
4.6 billion years
How long does it take to go from high tide to low tide?
6 hours and 12 minutes
How do scientists think the moon came into being?
A collision occurred between the earth and a large object that blasted away part of the earth's mantle
During this type of eclipse, the moon is farther from the earth and a ring of sunlight surrounds the dark disk
Annular Eclipse
Why do we always see the same side of the moon from Earth?
Because its period of rotation equals its period of revolution
Why don't solar and lunar eclipses occur every month?
Because the moon's orbit is tilted
When a small sliver of the moon is visible
Crescent
When the entire surface facing the Earth is illuminated; one whole side of the moon is visible
Full moon
When the moon is more than half full
Gibbous
When the Earth comes between the sun and the moon and the shadow of the Earth falls on the moon
Lunar eclipse
These tides occur during the 1st and 3rd quarter phases of the moon.
Neap Tides
When none of the moon's surface facing the earth is illuminated; none of the moon is visible
New moon
Are all eclipses visible?
No
Is the moon's atmosphere the same as Earths?
No, it is much thinner.
The lighter outer part of a shadow; the area in which the shadow of an object is partial
Penumbra
When one half of one side of the moon is visible
Quarter moon
These are caused by the tilt of the Earth's axis and take place during new and full moon phases of the moon
Seasons
When the moon comes between the Earth and the sun and the shadow of the moon falls on part of the Earth; these occur during New Moon
Solar eclipse
Tides that are higher and lower than usual
Spring Tides
The season during which the northern hemisphere is tilted toward the sun, but the earth is farthest from the sun
Summer
What causes the phases of the moon?
The positions of the moon, Earth, and the sun in relationship to one another
These are caused by the pull of the moon on the Earth.
Tides
When the moon comes between the Earth and the sun and completely covers the sun as viewed from Earth
Total solar eclipse
The area in which the shadow of an object is total; the darkest inner part of the shadow of an eclipse
Umbra
When the visible portion of the moon is getting smaller
Waning
When the visible portion of the moon is getting larger
Waxing
The season when the earth is closest to the sun
Winter