Eclipses

DCS Code: 8A10.30 Last Updated: March 27, 2026
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Purpose

Models the Sun-Earth-Moon geometry for solar and lunar eclipses using a lamp, globe, and spheres. Students see how alignment creates umbra and penumbra shadow zones, and why eclipses don't occur every month (the Moon's 5° orbital inclination).

Globe representing Earth on a round wooden table, flanked by two white spheres on clamp stands representing the Moon at different positions, illuminated from one side against a dark background
Figure 1: Eclipse geometry setup: a globe (Earth) with two white spheres (Moon) on clamp stands positioned on either side. A light source (Sun, off-frame) illuminates the arrangement, casting a visible shadow on the globe.
Equipment