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The Short Answer: We have a slightly different view of the Moon each night. We describe how the Moon looks with the eight Moon phases, or shapes: 🌑 New 🌒 Waxing Crescent 🌓 First Quarter 🌔 Waxing Gibbous 🌕 Full 🌖 Waning Gibbous 🌗 Third Quarter 🌘 Waning Crescent  If you have looked into the night sky, you may have noticed the Moon appears to change shape each night. Some nights, the Moon might look like a narrow crescent. Other nights, the Moon might look like a bright circle. And on other nights, you might not be able to see the Moon at all. The different shapes of the Moon that we see at different times of the month are called the Moon’s phases. The Moon’s appearance changes throughout the month. Credit: NASA's Scientific Visualization Studio Why does this happen? The shape of the Moon isn’t changing throughout the month. However, our view of the Moon does change. The Moon does not produce its own light. There is only one source of light in our solar system, and that is the Sun. Without the Sun, our Moon would be completely dark. What you may have heard referred to as “moonlight” is actually just sunlight reflecting off of the Moon’s surface. The Sun’s light comes from one direction, and it always illuminates, or lights up, one half of the Moon – the side of the Moon that is facing the Sun. The other side of the Moon is dark. The position of the Moon and the Sun during Each of the Moon’s phases and the Moon as it appears from Earth during each phase. Credit: NASA/JPL-Caltech On Earth, our view of the illuminated part of the Moon changes each night, depending on where the Moon is in its orbit, or path, around Earth. When we have a full view of the completely illuminated side of the Moon, that phase is known as a full moon. But following the night of each full moon, as the Moon orbits around Earth, we start to see less of the Moon lit by the Sun. Eventually, the Moon reaches a point in its orbit when we don’t see any of the Moon illuminated. At that point, the far side of the Moon is facing the Sun. This phase is called a new moon. During the new moon, the side facing Earth is dark. The eight Moon phases:🌑 New: We cannot see the Moon when it is a new moon. 🌒 Waxing Crescent: In the Northern Hemisphere, we see the waxing crescent phase as a thin crescent of light on the right. 🌓 First Quarter: We see the first quarter phase as a half moon. 🌔 Waxing Gibbous: The waxing gibbous phase is between a half moon and full moon. Waxing means it is getting bigger. 🌕 Full: We can see the Moon completely illuminated during full moons. 🌖 Waning Gibbous: The waning gibbous phase is between a full moon and a half moon. Waning means it is getting smaller. 🌗 Third Quarter: We see the third quarter moon as a half moon, too. It is the opposite half as illuminated in the first quarter moon. 🌘 Waning Crescent: In the Northern Hemisphere, we see the waning crescent phase as a thin crescent of light on the left. The Moon displays these eight phases one after the other as it moves through its cycle each month. It takes 27 days for the Moon to orbit Earth. That means the Moon's cycle is 27 days long. Here’s what the Moon looks like right now from Earth:Use this tool to see the current Moon phase and to plan ahead for other Moon views. Credit: NASA Interested in learning more about the Moon?
Related Resources for Educators Moon Phases Simulation Viewed from Earth and Space article last updated August 17, 2022 How many constellations does the Sun pass through every year? By observing the sky closely night by night, you would note that a particular star rises about 4 minutes earlier every night. If Earth's spin axis were perpendicular to Earth's orbital plane (i.e., no tilting of Earth's spin axis), then the seasons and seasonal variation would be nonexistent. All regions would experience all year around seasons- no change of season. During which month is Earth closest to the Sun? April October March January July When the Sun is at one of the equinoxes, day and night are of equal length (almost) everywhere on Earth. When people in the northern hemisphere experience spring, people in the southern hemisphere experience winter. spring. summer. autumn. It is warmer in summer than winter because (select all that apply) the days are longer. the Sun is lower in the sky and sunlight passes through more atmosphere, thereby warming it more during summer. Earth is closer to the Sun in summer. the Sun is higher in the sky. the days are shorter The days are longer. The Sun is higher in the sky. Astronomers living north of the Arctic Circle around the time of summer solstice will enjoy which of the following? On which dates does the Sun cross the celestial equator? March equinox (around March 21) September equinox (around September 23) Precession of Earth's spin axis results in (select all the apply) A. a cyclic variation over a period of a year of the constellations visible at night from Earth. B. an apparent motion of the stars across the sky every day. C. an apparent motion in the position of the Sun relative to the stars over a period of a year. D a gradual shift of the vernal equinox along the ecliptic. E. a gradual shift of the north and south celestial poles relative to the stars. a gradual shift of the vernal equinox along the ecliptic. a gradual shift of the north and south celestial poles relative to the stars. Which sentence best describes why the Moon goes through phases? We see only part of the lit-up face of the Moon depending on its position relative to Earth and the Sun. Which of the
following is the correct sequence of appearances of Moon phases in the sky? waxing crescent, first quarter, waxing gibbous, full moon You see a full moon setting in the west. Approximate what time is it? A lunar eclipse does not
occur at every full moon because B. the plane of the Moon's orbit is at an angle to the plane of Earth's orbit. A lunar eclipse is caused by the Moon passing into the shadow of Earth. A solar eclipse occurs on Earth when the Moon casts a shadow on Earth. How much of the total surface of the Moon is illuminated by the Sun when it is at quarter phase? one half all of it, one half) A full moon will be on the horizon at A full moon always occurs when the Moon is farther from the Sun than is Earth. Why does the Moon go through phases?The amount of Moon we see changes over the month — lunar phases — because the Moon orbits Earth and Earth orbits the Sun. Everything is moving. During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon. Earth's shadow covers all or part of the lunar surface.
Why does Earth's moon go through phases quizlet?The phases of the moon are caused by its position in its orbit relative to the Earth and the Sun. The phases occur because, as the moon revolves around the Earth, we observe different amounts of the side of the moon that is illuminated by the sun.
What appears to happen to the Moon as it goes through the cycle quizlet?What appears to happen to the Moon as it goes through the cycle? The moon appears to change shape or get lighter and darker as it passes through its cyclic monthly phase.
Which of the following best describes why we see the Moon at different phases 1 point?The phases occur because the Sun lights different parts of the Moon as the Moon revolves around the Earth. That means the reason we see different phases of the Moon here on Earth is that we only see the parts of the Moon that are being lit up by the Sun.
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Which sentence best describes why the moon goes through phases?
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