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science4h ago
When Earth illuminates the Moon: The phenomenon of earthshine and how to observe it
- Earthshine causes a faint glow on the Moon’s dark side when sunlight reflects off Earth and reaches the Moon.
- Earthshine is most visible just after new moon or just before new moon during waxing or waning phases.
- A planet-wide reflectivity, or albedo, and surface features like clouds and oceans influence earthshine’s brightness.
- No telescope is required; observe after sunset or before sunrise for best views.
- Earthshine illustrates a steady Earth–Moon interaction in a light balance.
- The Moon’s near-fully illuminated Earth would appear from the Moon as a bright planet.
- Earth’s brightness during earthshine depends on cloud cover, snow, and oceans.
- Observers should seek dark skies away from light pollution for a better view.
- Earthshine helps us understand how light travels from the Sun to Earth and then to the Moon.
- Earthshine is tied to the Moon's phases around the new Moon cycle.
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