Eclipses Vocabulary and Concepts Lunar Eclipse * Total * Partial * Umbra * Penumbra * Earth, sun, moon relationships Solar eclipses * Total * Annular * Partial * Apogee * Perigee * Earth, sun, moon relationships * Eclipse seasons Two Types * Solar – Moon passes between Sun and Earth * Lunar – Moon passes through the Earth’s shadow. Causes * Earth orbits the Sun * Moon orbits the Earth
* Moon and Sun have same angular size. * Moon is small but close * Sun is large but far away Shadow Parts * Umbra is darker central portion. * Penumbra is weak outer portion and difficult to see. Eclipse Geometry Solar Eclipses * Occur only at new moon. * Very localized: * Inside umbra you see a total or annular eclipse. * Inside penumbra you see a partial eclipse. Three Types of Solar Eclipses * Total inside umbra path. * Partial inside penumbra path. * Annular umbra does not reach the Earth. Solar Eclipse Pictures
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- Spring '13
- Partial Umbra Penumbra