AST 111 Final Exam Study Guide || with Error-free Solutions.

Why does the Moon show phases in the course of a month? a. the Moon glows from the inside, and its various continents glow different amounts b. the angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight c. more or less light from the Earth is reflected as the Moon turns around it d. clouds get in the way of the Moon's light and cover up parts of it e. the Earth's shadow falls on the Moon to different degrees as the Moon goes around correct answers b. the angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight In Australia (in the Southern Hemisphere), when are the days the shortest and the nights the longest? a. in late December b. in late March c. in late June d. in late April e. days and nights are pretty much the same length throughout the year in Australia correct answers c. in late June Typically, astronomers express the right ascension of a star on the sky in what units? a. hours, minutes, and seconds b. kilometers c. quarters d. light years e. meters squared correct answers a. hours, minutes, and seconds The point in the sky directly above your head at any given time is called the a. zenith b. horizon point c. celestial pole d. nadir e. bald spot correct answers a. zenith When a planet temporarily moves westward in the sky over the course of several weeks or months (instead of eastward, as it typically does), we call it: a. precession b. circumpolar motion c. retrograde motion d. rude e. ecliptic motion correct answers c. retrograde motion