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Chapter 2: Problem 12

Briefly describe the Moon's cycle of phases. Can you ever see a full moon at noon? Explain.

Short Answer

Expert verified
No, you cannot see a full moon at noon because it is below the horizon.

Step by step solution

01

Understanding the Moon's Cycle

The Moon goes through a cycle of phases that lasts about 29.5 days. These phases are determined by the relative positions of the Earth, Moon, and Sun. The cycle includes new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent.
02

Describing the Full Moon Phase

A full moon occurs when the Earth is between the Sun and the Moon, and the side of the Moon that faces Earth is fully illuminated by sunlight. This happens approximately halfway through the lunar cycle.
03

Checking the Full Moon's Position at Noon

At noon, the Sun is generally at its highest point in the sky. During a full moon, the Moon is on the opposite side of the Earth from the Sun. As a result, the full moon will be below the horizon during the day and will rise at sunset, making it visible at night.
04

Conclusion

Therefore, you cannot see a full moon at noon because it is below the horizon during the day. The full moon is visible at night when it rises around sunset and sets around sunrise.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Moon cycle
The Moon cycle, better known as the lunar cycle, is the period in which the Moon completes a full orbit around the Earth and goes through all its phases. These phases include the new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent. This entire process takes about 29.5 days.

Each phase changes based on the positions of the Earth, Moon, and Sun. As the Moon orbits Earth, humans see varying portions of its surface lit by the Sun. This change in visibility creates the familiar lunar phases.
  • New Moon: Moon is between Earth and Sun; the side facing Earth is dark.
  • First Quarter: Half of the Moon is visible; right side illuminated.
  • Full Moon: Earth is between Moon and Sun; entire face visible.
  • Last Quarter: Half of the Moon is visible; left side illuminated.
Full moon visibility
A full moon is a mesmerizing sight shining brightly in the night sky. Its visibility is limited to the night because of the positions of the Earth, Moon, and Sun.

During this phase, the Moon is situated on the opposite side of Earth from the Sun. Therefore, it becomes visible to us only when the Sun sets and the night falls. This occurs because the full moon rises as the Sun sets and sets as the Sun rises.
  • Full moon rises at sunset.
  • Visible throughout the night.
  • Sets shortly after the sunrise.
This placement explains why a full moon cannot be seen during the day when the Sun dominates the sky.
Earth-Moon-Sun positions
The positions of the Earth, Moon, and Sun are crucial for determining the phase of the Moon and its visibility. Depending on where each is located relative to the other two, different portions of the Moon become illuminated and visible from Earth.

For a new moon, the Moon is positioned directly between the Sun and Earth. When it's a full moon, the order is Sun, Earth, and Moon. These alignments cause the varying illumination of the Moon that we see as phases.
  • New Moon: Moon between Earth and Sun.
  • Full Moon: Earth between Moon and Sun.
These positions not only affect lunar phases but also influence solar and lunar eclipses.
lunar cycle duration
The duration of the lunar cycle, often referred to as a synodic month, is approximately 29.5 days. This period marks the time needed for the Moon to return to the same phase (e.g., full moon to full moon).

The cyclicity is not just a mere repetition but a celestial dance choreographed by gravitational pulls and orbital motions. Over this time, each of the Moon's distinct phases will have been on display at least once.
  • Approximately 29.5 days for a complete cycle.
  • Not to be confused with sidereal month, which is about 27.3 days.
Understanding the duration is key to predicting lunar phases and planning events around them, like religious observances and scientific studies.

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Most popular questions from this chapter

Suppose you lived on the Moon, in which case you would see Earth going through phases in your sky. Assume you live near the center of the face that looks toward Earth. a. Suppose you see a full Earth in your sky. What phase of the Moon would people on Earth see? Explain. b. Suppose people on Earth see a full moon. What phase would you see for Earth? Explain. c. Suppose people on Earth see a waxing gibbous moon. What phase would you see for Earth? Explain. d. Suppose people on Earth are viewing a total lunar eclipse. What would you see from your home on the Moon? Explain.

Search the Web for sources of daily information about sky phenomena (such as lunar phases, times of sunrise and sunset, or dates of equinoxes and solstices). Identify and briefly describe your favorite source.

There are \(360^{\circ}\) in a full circle. a. How many arcminutes are in a full circle? b. How many arcseconds are in a full circle? c. The Moon's angular size is about \(\frac{1}{2}\). What is this in arcminutes? In arcseconds?

Find information about an upcoming solar or lunar eclipse. Write a one- to three-page report about how you could best observe the eclipse, including any necessary travel to a viewing site, and what you could expect to see. Bonus: Describe how you could photograph the eclipse.

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences. Beijing and Philadelphia have about the same latitude but very different longitudes. Therefore, tonight's night sky in these two places (a) will look about the same. (b) will have completely different sets of constellations. (c) will have partially different sets of constellations.
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