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Lunar phase: Quiz

  
  
















Question 1: This synodic month is longer than the time it takes the Moon to make one orbit about the Earth with respect to the fixed stars (the ________), which is about 27.32 days.
Julian calendarGregorian calendarIslamic calendarMonth

Question 2: A lunar phase or phase of the moon refers to the appearance of the illuminated portion of the ________ as seen by an observer, usually on Earth.
MoonMercury (planet)Ganymede (moon)Io (moon)

Question 3: If the half-ellipse is convex with respect to the half-circle, then the shape will be gibbous (bulging outwards), whereas if the half-ellipse is concave with respect to the half-circle, then the shape will be a ________.
Middle EastIslamCrescentAsia

Question 4: Although an ________ can only occur when the Moon is either new or full, it must also be positioned very near the intersection of Earth's orbit plane about the Sun and the Moon's orbit plane about the Earth (that is, at one of its nodes).
PlutoPlanetEclipseJupiter

Question 5: The lunar phases vary cyclically as the Moon orbits the Earth, according to the changing relative positions of the ________, Moon and Sun.
NatureMarsVenusEarth

Question 6: The phases of full moon and new moon are examples of ________, which occur when the Earth, Moon and Sun lie (approximately) in a straight line.
SyzygyMarsConjunction (astronomy and astrology)Eclipse
















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