PHSC 121 Quiz 1

PHSC 121 Quiz 1 Liberty University

  1. Flux is a measure of the light energy from a star that hits a collecting area of one square meter in one second.
  2. The seasons are caused by Earth’s orbit moving closer to or farther from the Sun.
  3. What was the purpose of the IAU establishing 88 official constellations?
  4. The brightest star you can see from the Earth is
  5. You are facing due west at sunset.  You notice the sun is setting a good bit to your right.  Which of these could be a date for making such an observation in Lynchburg, VA?
  6. What is an asterism?
  7. What is the cause for the slow movement of reference marks, such as the celestial poles and equator, to move across the sky?
  8. If star A is 14.5 times brighter than star B, then what is their magnitude difference?
  9. Day and night cycles are caused by the ____ of Earth.
  10. What is the name of constellations that appear to never rise or set?
  11. Which is an example of an asterism?
  12. Earth’s rotation is connected with a very slow celestial motion that can be detected only over _____
  13. The sky appears to rotate eastward around Earth each day, but that is a consequence of the westward rotation of Earth.
  14. Which planet is often called our most brilliant “morning star”?
  15. Even though modern astronomers know that stars are scattered through space at different distances, they still use what scientific model to describe celestial locations in the sky?
  16. When the Moon is totally eclipsed, the Moon is illuminated by some sunlight reflected by Earth’s atmosphere.
  17. The angular diameters of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical.
  18. Our calendar divides the year into 30-day periods in recognition of the synodic cycle of the Moon.
  19. There is one side of the Moon that can never be seen directly by observers on Earth.
  20. What conditions are necessary for an annular solar eclipse—an eclipse in which the moon cannot completely cover the face of the sun?
  21. In most months, there are no eclipses.
  22. Between 2015 and 2024, in which year would there be no opportunities for a solar eclipse?
  23. If new moon fell on March 2nd, what is the Moon’s phase on March 18th?
  24. Why can’t the Moon always pass through the center of the umbra?
  25. What is a new moon?
  26. If the Moon is too far from Earth during a solar eclipse, the _____ does not reach Earth’s surface.
  27. When the Moon is directly opposite the Sun in the sky, its phase is:
  28. At what point is the Moon closest to Earth?
  29. What astronomical period takes 18 years 11 1/3 days to complete?
  30. Why is there a two day difference in the sidereal and synodic months?
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