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Directions (66–85): Record your answers in the spaces provided in your answer booklet. Some questions
may require the use of the 2011 Edition Reference Tables for Physical Setting/Earth Science
Base your answers to questions 66 through 69 on the graph below and on your knowledge of Earth science.
The graph shows changes in hours of daylight during the year at the latitudes of 0°, 30° N, 50° N and 60° N.

Explain why all four latitudes have the same number of hours of daylight on March 20 and September 22.

Directions 6685 Record your answers in the spaces provided in your answer booklet Some questions may require the use of the 2011 Edition Reference Tables for Ph class=

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oopsydaisy
After some research and studying the graph you posted with your question, there are many reasons why all four latitudes have the same number of hours of daylight on March 20th and also September 22nd. 

Some of the reasons are:

These two dates are equinoxes, the sun's direct rays are over the equator, and the Earth's North Pole is not is not tilted toward or away from the Sun on those specific dates. Any of these answers are acceptable for the question you asked. 

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