Lunar and Annular Eclipses Quiz
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Questions and Answers

What causes the phases of the moon?

  • Spherical shape; orbital motion around the sun
  • Cubical shape; orbital motion around the sun
  • Spherical shape; orbital motion around Earth (correct)
  • Cubical shape; orbital motion around Earth

    • When is a waxing crescent moon visible?

  • Near the western horizon just after sunset (correct)
  • Near the eastern horizon just after sunset
  • Near the eastern horizon just before sunrise
  • Near the western horizon just before sunrise

    • When does the first quarter moon rise?

  • At about noon (correct)
  • At about midnight
  • At sunset
  • At sunrise

    • Which moon phase is visible above the western horizon a couple of hours before sunrise?

    <p>Waning gibbous</p> Signup and view all the answers

    How much does the moon move eastward in the sky each night?

    <p>$13°$</p> Signup and view all the answers

    What is the synodic period of the moon?

    <p>The period of time from when the moon rises until the moon rises again the next night</p> Signup and view all the answers

    What must be true during a total lunar eclipse?

    <p>The moon will glow a coppery red</p> Signup and view all the answers

    When is a total lunar eclipse visible?

    <p>Only during a new moon</p> Signup and view all the answers

    What conditions lead to the occurrence of a solar or lunar eclipse?

    <p>When the sun is near the solstice, and the moon is new or full</p> Signup and view all the answers

    What defines an eclipse season?

    <p>Line of nodes crosses the moon's orbit</p> Signup and view all the answers

    What type of eclipse is it when the moon enters Earth's shadow but does not reach the umbra?

    <p>Penumbral</p> Signup and view all the answers

    When will the full moon be highest above the southern horizon for an observer in the Northern Hemisphere?

    <p>At midnight near the vernal equinox</p> Signup and view all the answers

    During a total lunar eclipse, which of the following are true?

    <p>The photosphere of the sun is obscured.</p> Signup and view all the answers

    Why does a totally eclipsed moon glow coppery red?

    <p>Red light is better able to pass completely through Earth's atmosphere and reach the moon.</p> Signup and view all the answers

    When do total lunar eclipses always occur?

    <p>During the time of new moon.</p> Signup and view all the answers

    Which event causes a lunar eclipse?

    <p>Earth's moon passes between Earth and the sun.</p> Signup and view all the answers

    What is the angle between the southern horizon and the full moon at midnight during different seasons?

    <p>It remains constant at all times of the year.</p> Signup and view all the answers

    During a total solar eclipse, which of the following is not visible?

    <p>The photosphere of the sun</p> Signup and view all the answers

    What is a solar eclipse called when the moon's umbra does not reach Earth's surface?

    <p>Annular solar eclipse</p> Signup and view all the answers

    In the context of solar eclipses, what is the Saros cycle?

    <p>All of the above</p> Signup and view all the answers

    What determines the phase of the Moon on a particular night?

    <p>Relative positions of the Sun, Earth, and Moon</p> Signup and view all the answers

    When would a total solar eclipse visible in Montana on Feb. 26, 1979, be visible again in Montana?

    <p>Within 3 days of March 29, 2033</p> Signup and view all the answers

    What is the length of the Saros cycle?

    <p>Saros cycle</p> Signup and view all the answers

    What would an observer in London see when someone in Los Angeles sees a first quarter Moon?

    <p>A full moon</p> Signup and view all the answers

    If the Moon's orbital plane was aligned with the celestial equator, what would be the consequence?

    <p>We could have eclipses every month</p> Signup and view all the answers

    Why doesn't Earth experience a solar eclipse every month?

    <p>Because the moon always keeps its same side toward the Earth</p> Signup and view all the answers

    From measuring the Moon's angular diameter in our sky, what can we find?

    <p>The mass density of the Moon if we know its distance from Earth</p> Signup and view all the answers

    When does a Full Moon always occur?

    <p>When the Moon is closer to the Sun than the Earth is</p> Signup and view all the answers

    In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from Earth?

    <p>Eastward</p> Signup and view all the answers

    Study Notes

    Phases of the Moon

    • The phases of the moon are caused by its spherical shape and orbital motion around Earth.
    • The moon's phases are determined by the relative positions of the Sun, Earth, and Moon.

    Moon's Orbit

    • The moon moves about 13° eastward in the sky each night.
    • The moon's synodic period is the time it takes for the moon to repeat its cycle of phases, which is approximately 29.5 days.
    • The moon's sidereal period is the time it takes for the moon to orbit Earth once with respect to the stars.

    Lunar Eclipse

    • A lunar eclipse occurs when Earth passes between the Sun and the Moon, blocking the Sun's light from reaching the Moon.
    • A total lunar eclipse occurs when the Moon is in Earth's umbra.
    • The Moon appears coppery red during a total lunar eclipse because red light is better able to pass through Earth's atmosphere.

    Solar Eclipse

    • A solar eclipse occurs when the Moon passes between Earth and the Sun, blocking the Sun's light from reaching Earth.
    • A total solar eclipse occurs when the Moon's umbra reaches Earth's surface.
    • An annular eclipse occurs when the Moon's umbra does not reach Earth's surface.
    • A total solar eclipse is only visible from the path of totality.

    Eclipse Seasons and Cycles

    • An eclipse season is the period of time when the Moon is near a node in its orbit, making eclipses possible.
    • The saros cycle is a period of 18 years, 111/3 days, after which the alignments of the Sun, Moon, and Earth are repeated, making eclipses predictable.

    Moon's Visibility

    • The phase of the Moon on a particular night is determined by the relative positions of the Sun, Earth, and Moon.
    • The Moon's visibility is affected by the Moon's distance from Earth and the position of the observer on Earth.

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    Description

    Test your knowledge about lunar and annular eclipses with this quiz. Identify key characteristics, such as the conditions required for a total lunar eclipse and the features of an annular eclipse.

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