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100
What is rotation?
turning or spinning of a body on its axis
100
What are the two primary motions of earth?
rotation and revolution
100
What is revolution?
motion of a body, such as a planet or moon, along a path around some point in space
100
What is axil precession?
another very slow motion
100
mean solar days averages how many hours?
24 hours
200
Earth has two types of days, which are?
mean solar day and sidereal day
200
What is mean solar day?
the time interval from one noon to the next
200
What is sidereal day?
the time it takes for earth to make one complete rotation
200
What is ecliptic?
the apparent annual path of the sun against the backdrop of the celestial sphere
200
sider=?
sider=star
300
Aphelion's distance occurs what day?
July 4th
300
When has the sun reached its highest point in the sky?
noon
300
What is the plane of ecliptic?
the imaginary plane that connects points along the ecliptic
300
Revolution: each day, this apparent movement amounts to a distance equal to about ___ degree or about ___ the suns width
one, twice
300
perihelion's distance occurs what day?
January 3rd
400
What are the main consequences of earths rotation?
day and night
400
What type of effect does precession have on the seasons?
minor effect
400
t/f axis points continually changes
true
400
helios=?
sun
400
What does peri mean in perihelion?
peri=near
500
What is similar to the "wobble" of a spinning top?
the axis that traces a circle on the sky
500
How is sidereal measured by?
measured in solar time
500
Sidereal has a period of how many hours?
23 hours
500
Earth axis is tilted at how many degrees?
23 1/2
500
How many minutes shorter is sidereal day than the mean solar day?
4 minutes