Why is the full Moon phase generally avoided by amateur astronomers seeking to study surface topography?

Answer

Sunlight illuminates the Moon almost directly, washing out shadows.

During the full phase, sunlight illuminates the Moon almost directly from the observer's perspective. This near-direct illumination minimizes the shadows cast by craters and lunar maria, making surface topography difficult to discern due to a lack of contrast.

Why is the full Moon phase generally avoided by amateur astronomers seeking to study surface topography?
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