Partial eclipse

Definition

A partial eclipse occurs when only a portion of the Sun or Moon is obscured by another celestial body. This happens when the Earth, Moon, and Sun are not perfectly aligned.

5 Must Know Facts For Your Next Test

1. During a partial solar eclipse, part of the Sun is covered by the Moon's shadow, resulting in a crescent-shaped appearance.
2. A partial lunar eclipse occurs when only a portion of the Moon enters Earth's penumbra or partially enters its umbra.
3. Unlike total eclipses, partial eclipses do not result in complete darkness; some sunlight or moonlight remains visible.
4. Partial eclipses are more common than total eclipses and can be observed from broader geographic areas.
5. Special eye protection is necessary to safely view a partial solar eclipse to prevent eye damage from direct sunlight.

Review Questions

• What differentiates a partial eclipse from a total eclipse?
• Why is it important to use special eye protection during a partial solar eclipse?
• Can you explain why partial eclipses are more commonly observed than total eclipses?

Related terms

Total Eclipse: When the entire Sun or Moon is fully obscured by another celestial body, resulting in complete coverage.

Umbra: The darkest part of a shadow where the light source is completely blocked during an eclipse.

Penumbra: The outer part of a shadow where only part of the light source is obscured during an eclipse.