Questions about geometric albedo and phase angle

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SUMMARY

The discussion clarifies the concept of geometric albedo and phase angle in relation to lunar visibility. It establishes that the Earth does not completely eclipse the moon during its full phase due to the inclination of the moon's orbit relative to the Earth-Sun plane. Full phase refers to the maximum illumination of the moon as defined by the lunar cycle, rather than absolute completeness. The conversation also highlights that eclipses occur when the Earth blocks sunlight from reaching the moon, resulting in a true complete full moon.

PREREQUISITES
  • Understanding of lunar phases and cycles
  • Basic knowledge of geometric albedo
  • Familiarity with orbital mechanics
  • Concept of phase angle in astronomy
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  • Research the concept of geometric albedo in planetary science
  • Study the mechanics of lunar eclipses and their frequency
  • Explore the effects of orbital inclination on celestial visibility
  • Learn about the lunar cycle and its phases in detail
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Astronomy enthusiasts, educators, and students seeking to deepen their understanding of lunar visibility, phase angles, and the mechanics of celestial bodies.

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If our sun is the source of illumination, how can an object be observed from the Earth at full phase? Wouldn't the Earth eclipse the object? So then why can we see a full moon during full phase? Is it because the moon's orbit is inclined wrt to the Earth-Sun orbit? If so then wouldn't this by definition not be full phase?
 
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You're right, full phase isn't perfectly-completely illuminated... but the deviation is small. Full phase is defined relative to the lunar cycle, i.e. full = maximum, not complete illumination. Eclipses do happen when the Earth blocks the sunlight from the moon---which is when it would have been a truly complete full-moon.
 

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