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Geog1- Midterm Section 1


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Antartic Circle
66.5 S parallel
The point in Earth's elliptical orbit at which the Earth is farthest from the Sun.
Arctic Circle
66.5 N parallel
circle of illumination
The edge of the sunlit hemisphere that is a great circle separating Earth into a light and dark half.

Determines the length of day.

During the Equinox it splits in half along the poles.
The parallel of 0 latitude.

Geographical reference point.

Things move the fastest here due to rotation.

Reference point for latitude.
equatorial plane
An imaginary plane that passes thru Earth halway between the poles and perpendicular to the axis of rotation.
Point where the subsolar point is at the equator. Twice a year- March 20th & September 22nd. "The time of equal days and nights."

Circle of illumination touches both poles making daylight and darkness each 12 hours all over Earth.

Represent the midpoints in the shifting of the rays of the Sun between the two tropics.
inclination of the sun
Latitude of the subsolar point, or where the sun is 90 degrees overhead.
international date line
Separates one day from another.

180 meridian, Greenwich.

Cross it going west: Earlier in clock time, a day later.
Part of the geographic reference grid.

0 reference is the equator. Goes to 90 at the poles.

Says how far away North or South you are from the equator.

Important parallels: Equator, North Pole, South Pole, Tropic of Cancer, Tropic of Capricorn, Arctic Circle, and Antarctic Circle.
Part of the geographic reference grid.

Runs North and South, imaginary lines extending from pole to pole.

Also called meridians.

Only parallel where they cross the equator.

Prime meridion runs thru Greenwich, England. Measured east to west up to 180 degrees from the PM.
Another name for the longitude.

An imaginary line of longitude extending from pole to pole, crossing all parallels at right angles.
Another name for the latitude.

A circle resulting from connecting all the points on a line of latitude.
The point in its orbit where Earth is closest to the sun.
plane of the ecliptic
The orbital plane of the Earth around the sun.
polarity (parallelism)
A characteristic of Earth's axis where it always points towards Polaris (North Pole) at every point in its orbit around the sun. Axis is always parallel to itself at other points in its orbit.
prime meridian
The meridian passing throught the Royal Observatory in Greenwich England from which longitude is measured.
Point where the subsolar point is at one of the Tropics (23.5).

Twice a year. June 21st (24 hours of daylight at North pole, Tropic of Cancer) & December 21st (24 hr daylight at South Pole, Tropic of Capricorn)

Tilt of the Earth is at its most extreme towards or away from the sun.
subsolar point
Point at where the sun is 90 degrees overhead.

Remains at the same latitude throughout the day

The declination of the sun is the latitude of the subsolar point which changes over the course of the year.

This is the place that recieves the most solarenergy.
Tropic of Cancer
Parallel of 23.5 degrees North.

Marks the northernmost location reached byt he vertical rays of the Sun during Earth's revolution.
Tropic of Capricorn
Parallel of 23.5 degrees South.

Marks the southernmost location reached by the vertical rays of the Sun during Earth's revolution.

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