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AST 111 Exam | Questions (Latest Update) with Verified Answers
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AST 111 Exam | Questions (Latest Update) with Verified Answers
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AST 111 Exam | Questions (Latest Update)with Verified Answers
What is moonlight? - ✔✔Reflected sunlight
What does it mean when we have a full moon? - ✔✔The side of the moon facing us IS
receiving sunlight
What does it mean when we have a new moon? - ✔✔The side of the moon facing us IS NOT
receiving sunlight
How long does it take the Moon to orbit Earth? - ✔✔One lunar month
How long is a lunar month? - ✔✔29.5 solar days
True or False: The Moon's face changes every time it rotates the Earth. - ✔✔False; the
Moon's face NEVER changes from our perspective.
Under what conditions does an eclipse occur? - ✔✔The Moon and the Sun are perfectly
aligned.
When does a lunar eclipse occur? - ✔✔During a full moon
When does a solar eclipse occur? - ✔✔During a new moon
What is a total lunar eclipse? - ✔✔The Moon is entirely through the umbra.
, What is an annular solar eclipse? - ✔✔The Moon's umbral shadow doesn't reach Earth
What is a supermoon? - ✔✔The Moon is 12% bigger because it's closer to Earth.
When does a supermoon occur? - ✔✔During a full moon
What is the umbra? - ✔✔The darkest part of a shadow.
What is a prenumbra? - ✔✔The lightest part of a shadow.
Why don't we have eclipses more often? - ✔✔The Earth, Moon, and Sun must all be
perfectly aligned.
How many eclipse seasons are there a year? (If we're lucky) - ✔✔2
True or False: Everyone on the night time side of the Earth can see a lunar eclipse. - ✔✔True.
What is retrograde motion? - ✔✔The seemingly backwards motion of other planets.
Why do we witness retrograde motion? - ✔✔We're passing another planet in our orbit.
What are the ancient beliefs of astronomy? - ✔✔The Earth was the center of the universe;
everything orbited the Earth in perfect circles; the Earth is stationary.
What are epicycles? - ✔✔An orbital path added to planets to predict retrograde motion and
properly work out the mathematics of ancient astronomy.
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