Earth Science
Confusing the Moon's Phases with Eclipses
Students say the Moon's phases happen because Earth's shadow falls on the Moon each month.
Quick check
Why students make it
This feels reasonable because the dark part of the Moon looks like a shadow. Students often mix up the Moon's own day-night lighting with the special alignment that causes an eclipse.
The rule done right
Moon phases happen because we see different amounts of the Moon's sunlit half as the Moon orbits Earth. A lunar eclipse happens only when the Sun, Earth, and Moon line up closely enough for Earth's shadow to fall on the full Moon.
Related resources
-
Moon Phases Infographic -
Tides and Lunar Gravity Infographic - The Solar System Cheat Sheet
- Seasons & Earth's Axial Tilt Cheat Sheet
- Earth Science, Ocean Tides How the Moon Pulls the Water Worksheet
- Weather & Seasons Worksheet
- Astronomy, Stars, Galaxies, and the Universe Worksheet
- Moon Phases & Eclipse Geometry Explorer Tool
- Moon Visibility Simulator Tool
- Solar Eclipse Path Explorer Tool
- Moon Phases, Eclipses & Seasons Lab Lab
- Shadow Length Lab Lab
- Exoplanet Transit & Habitable Zone Lab Lab