https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:the-earth-sun-moon-system/x87d03b443efbea0a:the-moon-and-its-motions/v/phases-of-the-moon 2022-09-02T07:28:17.303436145Z Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/b33175fe-10b7-4f4f-91da-d8c1d61bb849_1280_720_base.png Phases of the moon A moon phase is the shape of moon's sunlit portion as seen from Earth. There are a total of eight moon phases: new, waxing crescent, first quarter, waxing gibbous, full, waning gibbous, third quarter, and waning crescent. These phases repeat every 29.5 days. https://cdn.kastatic.org/ka-youtube-converted/f592IgRzq2E.mp4/f592IgRzq2E.mp4 254 Earth and moon https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:the-earth-sun-moon-system/x87d03b443efbea0a:the-moon-and-its-motions/v/lunar-eclipses 2022-09-02T06:03:36.513343189Z Lunar eclipses A lunar eclipse occurs when Earth casts a shadow on the moon. When the shadow fully covers the moon, the eclipse is total. When the shadow partially covers the moon, the eclipse is partial. Lunar eclipses can occur only during a full moon, when the moon and the sun are on opposite sides of Earth. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/7c3d9a22-7ac2-404f-898b-0e58c62cc478_1280_720_base.png Lunar eclipses A lunar eclipse occurs when Earth casts a shadow on the moon. When the shadow fully covers the moon, the eclipse is total. When the shadow partially covers the moon, the eclipse is partial. Lunar eclipses can occur only during a full moon, when the moon and the sun are on opposite sides of Earth. https://cdn.kastatic.org/ka-youtube-converted/WXSHQK56Bfs.mp4/WXSHQK56Bfs.mp4 127 Earth and moon https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:the-earth-sun-moon-system/x87d03b443efbea0a:the-moon-and-its-motions/a/the-moon-and-its-motions 2026-04-30T07:30:36.209464894Z Key points: The moon and its motions Review your understanding of the moon and its motions in this free article aligned to NGSS standards. article https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:the-earth-sun-moon-system/x87d03b443efbea0a:the-moon-and-its-motions/e/understand-the-moon-and-its-motions 2026-04-30T07:30:36.209464894Z Understand: The moon and its motions Check your understanding of the moon and its motions in this set of free practice questions aligned to NGSS standards. Lauren Rosebrugh exercise https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:the-earth-sun-moon-system/x87d03b443efbea0a:the-moon-and-its-motions/e/apply-the-moon-and-its-motions 2026-04-30T07:30:36.209464894Z Apply: The moon and its motions Apply your understanding of the moon and its motions in this set of free practice questions aligned to NGSS standards. Lauren Rosebrugh exercise