Multiple choice

____, a Greek astronomer, explained how the phases of the Moon are caused.

  1. Aristotle

  2. Ptolemy

  3. Anaxagoras

  4. Copernicus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ptolemy, the Greek astronomer who lived in the 2nd century AD, developed a comprehensive model explaining lunar phases. His work in the Almagest described how the changing positions of the Sun, Earth, and Moon create the different phases we observe from Earth.

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