Question

1. which best explains why the earth is not disk - shaped? a. stars are viewed differently when traveling north and south. b. the shadow cast by the earth during a lunar eclipse is circular. c. the shadows cast in two different cities during a solstice differed in length. d. the only shape that cast a circular shadow in whatever direction is a sphere. 2. which of the following is an annual motion? a. moonrise b. eastward rise of stars c. sunset d. vernal equinox 3. what astronomical event was not known to men before the advent of telescopes? a. solar eclipse b. summer solstice c. retrograde of mars d. rotation of the sun

Explanation:

1. The Earth is spherical, and evidence such as the circular shadow it casts during a lunar eclipse shows this, not that stars are viewed differently when traveling north - south. So, the best explanation for why the Earth is not disk - shaped is related to the circular shadow during lunar eclipse.
2. Annual motion refers to the Earth's orbit around the Sun. Sunset is a daily motion, not an annual motion.
3. Before the advent of telescopes, solar eclipses, summer solstices, and vernal equinoxes were known astronomical events, while the retrograde motion of Mars was more difficult to observe without telescopes.

Answer:

1. B. The shadow cast by the Earth during a lunar eclipse is circular.
2. C. Sunset
3. C. Retrograde of Mars