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GEOG 1112: Lecture 1
The point where the earth is farthest from the sun is called what? |
aphelion |
The earth's orbit forms a what around the sun?
|
an elliptical |
The earth is closest to the sun during the northern hemisphere _____________. |
winter |
The shape of the earth's orbit around the sun __________________.
|
changes over time |
The main reason it is winter in the northern hemisphere is because what? |
the sun is closest |
Places that are curved away from the sun receive less what? |
insolation |
The point that is receiving insolation from directly overhead (perpendicular, 90 degrees) is called the what?
|
subsolar point |
The latitude is receiving insolation from directly overhead is called what? |
declination |
Not all places receive the same amount of light because what? |
the sun's rays are received at more of an angle. |
RED NOTE: As the tilt changes, the North (pole) star will not be what? |
Polaris |
What will be the north star AD 3000? |
Alrai |
The tilt of the earth's axis is currently what? |
23.5 degrees |
The earth _________ around its axis. |
rotates |
Right now, the earth's tilt is what? |
lessening |
What is when the tilt of the earth is in fixed alignment: the north star is always above the north pole? |
axial parallelism |
During a solstice, the sun's direct rays are ___________________ of the equator. |
23.5 degrees N or S |
During the winter, the sun's direct rays are what?
|
farther away, so temperatures are colder |
Solstices occur when? |
June and December |
The farthest the sun's direct rays ever get is what? |
23.5 degrees N latitude |
The direct rays of the sun are over the Tropic of Capricorn when? |
December |
The direct rays of the sun are over the Tropic of Cancer when? |
June |