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sunrise, sunset

• Source: Collins Dictionary of Astronomy.

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sunrise, sunset terminator

• Source: Collins Dictionary of Astronomy.

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Resources for calculation and modelling

• Source: Solar Energy Pocket Reference.

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Sun and Moon Data for One Day

• Source: The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide.

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Caste: Worker Polyethism in Social Hymenoptera

• Authors : Jandt Jennifer; Robinson Elva

• Source: Encyclopedia of Social Insects.

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THEATER

• Source: Handy Answer: The Handy History Answer Book: From the Stone Age to the Digital Age.

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Observation and Measurement

• Source: Handy Answer: The Handy Science Answer Book.

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OUT IN THE BIG WIDE OPEN: The Space Race and the Chance for Universal Peace (1957-1975)

• Source: Opinions Throughout History: Globalization.

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Astronomy 2019

• Source: Whitaker's Almanack 2019.

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Banneker, Benjamin 11/9/1731-10/9/1806

• Source: Encyclopedia of African-American Writing.

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