Astronomy Test- Study Guide
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what is precession?
Change in direction of the axis, but without any change in tilt
What is nutation?
a change in the angle 1/2 degree on way or another
What color are objects moving away from Earth? Towards? What principle does this have to due with?
Away- red Towards- blue Red Shift Principle
What causes seasons?
Angle of the sun is hitting the earth plus the revolution of the earth.
What are the two solstices?
Summer solstice, winter solstice
When does the summer solstice occur?
June 21-22
When does the winter solstice occur?
December 21-22
What are the two equinox?
Vernal, Autumnal
When does the vernal equinox occur?
March 21
When does the autumnal equinox occur?
September 21
When the alignment is sun, earth, moon, which eclipse is occurring?
Lunar
When the alignment is sun, moon, earth, what eclipse is occurring?
Solar
Which eclipse occurs the most often?
Lunar
How long does it take the moon to rotate?
27.3 days
How come you can see a new moon but a full moon?
• New moon has the sunlight pointing directly at it - Full moon, sun is on the opposite side of the earth, no sunlight reaches moon
what is a barycenter?
the common center of mass around which two or more bodies revolve