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1. skyandtelescope.org › astronomy-resources › what-areWhat Determines the Moon Phases? - Sky & Telescope

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   Jul 6, 2016 · At full Moon, the three bodies also lie approximately in a line, but this time, the Moon is on the opposite side of Earth, so the Sun illuminates the whole side facing us. At first quarter and last quarter, the Moon lies perpendicular to a line between Earth and the Sun. We see exactly half of the Moon illuminated by the Sun — the other half ...

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2. moon.nasa.gov › moon-in-motionOverview | Phases, Eclipses & Supermoons – Moon: NASA Science

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   The Moon is tidally locked with Earth, which means that it spins on its axis exactly once each time it orbits our planet. Because of this, people on Earth only ever see one side of the Moon. We call this motion synchronous rotation. The Moon’s orbit is tilted about 5 degrees compared to the plane of Earth’s orbit around the Sun.

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4. physics.stackexchange.com › questions › 6969Why does the light side of the moon appear not to line up ...

   physics.stackexchange.com › questions › 6969

   I am puzzled by you question. When one has two points, the sun and the moon, one can always find a line connecting them, by definition of line. If you mean why the earth is not part of that straight line, it is because the moon has an orbit around the earth, and the angle of the line earth-moon changes. It is the reason the moon has phases ...

5. phys.libretexts.org › Bookshelves › Astronomy4.6: Phases and Motions of the Moon - Physics LibreTexts

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   Jul 29, 2023 · The Moon’s Revolution and Rotation. The Moon’s sidereal period—that is, the period of its revolution about Earth measured with respect to the stars—is a little over 27 days: the sidereal month is 27.3217 days to be exact. The time interval in which the phases repeat—say, from full to full—is the solar month, 29.5306 days.

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     Scientists may now know why the moon's two sides are so different

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     Astronomy - Ch. 3: Motion of the Moon (11 of 12) Why Do We Only See One Side of the Moon?

     Sep 17, 2014

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     Why do we only see one side of the moon? Does the Moon rotate? Big Questions Explained!

     Jun 26, 2020

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7. science.nasa.gov › moon › moon-phasesMoon Phases - Science@NASA

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   The eight lunar phases are, in order: new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. The cycle repeats once a month (every 29.5 days). Like Earth, the Moon has a day side and a night side, which change as the Moon rotates. The Sun always illuminates half of the Moon while ...

8. www.planetary.org › articles › the-phases-of-theThe phases of the Moon explained - The Planetary Society

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   Apr 25, 2023 · Image: NASA. There are eight main Moon phases: New Moon: This is when you can’t see the Moon easily at all, because the part that is illuminated by the Sun is on the side of the Moon pointing away from Earth. This phase happens when the Moon is between the Sun and Earth. Because the Moon’s orbit around the Earth is tilted by about five ...

9. People also ask

   Which side of the Moon faces Earth?

   • Since the Sun is behind the Moon from Earth's perspective, the side of the Moon that faces Earth is dark. At full Moon, the three bodies also lie approximately in a line, but this time, the Moon is on the opposite side of Earth, so the Sun illuminates the whole side facing us.

   What Determines the Moon Phases? - Sky & Telescope

   skyandtelescope.org/astronomy-resources/what-are-the-phases-of-the-moon/

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   Does the Moon have a day side and a night side?

   • Like Earth, the Moon has a day side and a night side, which change as the Moon rotates. The Sun always illuminates half of the Moon while the other half remains dark, but how much we are able to see of that illuminated half changes as the Moon travels through its orbit.

   Moon Phases - NASA Science

   science.nasa.gov/moon/moon-phases/

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   Why does the sun light up different sides of the Moon?

   • The Sun lights up different sides of the Moon as it orbits around Earth – it's the fraction of the Moon from which we see reflected sunlight that determines the lunar phase. The new Moon occurs when the Moon, Earth, and Sun all lie along approximately the same line.

   What Determines the Moon Phases? - Sky & Telescope

   skyandtelescope.org/astronomy-resources/what-are-the-phases-of-the-moon/

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   What does a curved line across the Moon look like?

   • Here's how it looks: That is, the line across the moon appears perpendicular to the line towards the sun. Now the above is a flat drawing. The sky appears curved (i.e. the dome of the starry sky). So that curve may introduce some apparent distortion.

   Why does the light side of the moon appear not to line up correctly

   physics.stackexchange.com/questions/6969/why-does-the-light-side-of-the-moon-appear-not-to-line-up-correctly-with-the-eve

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   Does the Moon have a dayside?

   • Now most of the Moon’s dayside has come into view, and the Moon appears brighter in the sky. This is as close as we come to seeing the Sun’s illumination of the entire day side of the Moon (so, technically, this would be the real half moon). The Moon is opposite the Sun, as viewed from Earth, revealing the Moon’s dayside.

   Moon Phases - NASA Science

   science.nasa.gov/moon/moon-phases/

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   What happens if you can't see the Moon?

   • New Moon: This is when you can’t see the Moon easily at all, because the part that is illuminated by the Sun is on the side of the Moon pointing away from Earth. This phase happens when the Moon is between the Sun and Earth. Because the Moon’s orbit around the Earth is tilted by about five degrees, it’s usually either above or below the Sun.

   The phases of the Moon explained | The Planetary Society

   www.planetary.org/articles/the-phases-of-the-moon-explained

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10. spaceplace.nasa.gov › moon-phases › enWhat Are the Moon’s Phases? - NASA Space Place

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    Nov 8, 2024 · 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 ...