Earth, sun and moon

9.The lunar phases are opposite for observers in the Northern and Southern Hemispheres.

10.What is the average duration of a lunar month?

11.In the Northern Hemisphere, during which season does a full moon appear highest in the sky?

12.Arrange the following events in the correct sequence for a waxing phase starting from new moon.

13.What is the term for the Moon's phase when the illuminated portion is increasing?

14.What is the primary cause of the changing phases of the Moon as seen from Earth?

15.Which of the following is a minor (intermediate) lunar phase?

16.The Moon is tidally locked to the Earth, meaning the same side always faces Earth.

17.Which of the following phases are considered 'waning' phases? (Select all that apply.)

18.In a classroom demonstration, a student uses a torch (flashlight) to represent the Sun and a small ball to represent the Moon. She holds the ball at arm's length and moves it around her head, which represents Earth. When the ball is directly between the torch and her head, which phase is being modeled?

19.The Moon is tidally locked to Earth, meaning that the same side of the Moon always faces Earth.

20.Which of the following diagrams would best represent the positions of Earth, Sun, and Moon during a full moon? (Assume the diagram is not to scale and the observer is on Earth.)

21.A student claims that in the Northern Hemisphere, a full moon appears highest in the sky during the summer solstice. Is this correct?

22.Arrange the following lunar phases in the correct order starting from new moon.

23.A lunar month is exactly 30 days long.

24.During which lunar phase does the Moon appear highest in the sky at midnight in the Northern Hemisphere?

25.The Moon is tidally locked to Earth, meaning the same side always faces Earth.

26.In the Northern Hemisphere, a full moon appears highest in the sky during the summer solstice.

27.Which of the following are considered 'waning' phases? (Select all that apply.)

28.A student observes that the Moon appears highest in the sky at midnight during winter in the Northern Hemisphere. Which phase is the Moon most likely in?

29.Which of the following are intermediate (minor) lunar phases? (Select all that apply.)

30.A student sets up a model using a torch to represent the Sun and a small ball on a stick to represent the Moon. She holds the ball at arm's length and rotates around herself to model the Moon's orbit. Which of the following is the most important limitation of this model?

31.A student uses a spherical ball to model the Moon and a bright lamp to model the Sun. She observes the ball's lit portion from a fixed point representing Earth. She rotates the ball around herself in a horizontal circle. Which change would make the model more accurate for demonstrating lunar phases?

32.Which of the following are common student misconceptions about the cause of lunar phases? (Select all that apply.)

33.In a classroom model where a student holds a ball representing the Moon and walks around a lamp representing the Sun, the student's head represents Earth. If the student faces the lamp, the ball in front of them will appear completely dark (new moon).

34.Match each description of a lunar phase model with the correct phase.

35.Arrange the following steps in the correct order to demonstrate the cause of lunar phases using a model: a) Observe the lit portion of the ball from Earth's perspective. b) Place the lamp (Sun) at a fixed location. c) Move the ball (Moon) to different positions around your head (Earth). d) Record the shape of the lit part at each position.

36.Which of the following is a correct description of the waxing crescent phase?

37.What is the term for the apparent shape of the Moon as seen from Earth?

38.Which lunar phase occurs when the Moon is between Earth and the Sun?

39.A student in Sydney, Australia (Southern Hemisphere) observes the Moon. At the same time, a student in London, England (Northern Hemisphere) observes the Moon. Which statement about their observations is correct?

40.In the Northern Hemisphere, a first-quarter moon appears highest in the sky at the spring equinox.

41.Complete the sentence.

42.On average, how many days does each intermediate lunar phase last?

43.What phenomenon may be apparent during a crescent moon, where the night side of the Moon dimly reflects indirect sunlight reflected from Earth?

44.A lunar month averages about 29.5 days. If a full moon occurs on January 1, approximately what date (in January or February) will the next new moon occur? Round to the nearest day.

45.Complete the sentence:

46.Explain why the same side of the Moon always faces Earth.

47.If a lunar month averages 29.53 days, what is the average duration in days of each intermediate lunar phase (e.g., waxing crescent)? Round to two decimal places.

48.A lunar month averages about 29.5 days. How many days does each intermediate lunar phase (e.g., waxing crescent) last on average? Round your answer to two decimal places.

49.What term is used to describe the phenomenon where the night side of the Moon is dimly illuminated by sunlight reflected from Earth?

50.What is the name given to the phase when the Moon's illuminated portion is decreasing?

51.What is the name given to the phase when the Moon's illuminated portion is increasing?

52.What is the term for a moon that appears as a thin sliver just before the new moon?

53.Explain why the lunar phases are opposite for observers in the Northern and Southern Hemispheres.

54.Explain why lunar phases are opposite for observers in the Northern and Southern Hemispheres.

55.Explain why a lunar eclipse does not occur every full moon.

56.On average, how many days does each intermediate lunar phase last?

57.A lunar month averages about 29.5 days. If a full moon occurs on January 1, approximately what date (in January or February) will the next new moon occur? Round to the nearest day.

58.If a lunar month averages 29.53 days, what is the average duration in days of each intermediate lunar phase (e.g., waxing crescent)? Round to two decimal places.

59.A lunar month averages about 29.5 days. How many days does each intermediate lunar phase (e.g., waxing crescent) last on average? Round your answer to two decimal places.