Sunday, September 27, 2009

ES HW if you lost your handout

Materials:
-standard protractor
-rectangular cardboard (12cm x 20cm)
-ruler
-circular cardboard (5cm in radius)
-single hole paper fastener

Procedure:
Using a protractor, divide the circle in 15 degree angles. The lines should meet at the center. The circle represents the earth, its center the north pole. Each line represents half of a meridian. Label each meridian in multiples of 15. Start from 0 or the prime meridian and move eastward (to the right) until you reach 180 degrees. Starting again from the same 0 degrees, move westward (to the left) and label the meridians in multiples of 15 up to 180. The 180 degree meridian is the international dateline. Meridians are either east of west of the prime meridian. Mark W all the time zones to the left of the prime meridian and E all the time zones to the right of the prime meridian.
Draw a broken line between the meridians. The area bounded by two nearby broken lines is a time zone. All places within the same time zone have the same time.
1. From what direction do we view the earth represented by the circle?
2) How many time zones did you draw?
3)Which meridian was difficult to label? Why?
Attach the cardboard circle to the cardboard rectangle with the paper fastener. This way you can turn the circle. Draw parallel lines on the rectangle and label the middle lines. Turn the circle to have the 0 degree meridian directly facing the sun's rays on the rectangle. Label on the rectangle the hour of each zone.

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