The configuration when a planet appears 90 degrees away from the Sun as seen from Earth, occurring at first and last quarter phases for the Moon. At quadrature, we see exactly half of the illuminated hemisphere.
From Latin 'quadratura' meaning 'a squaring' or 'making square,' referring to the 90-degree angle formed. The term entered astronomical usage in medieval times when astronomers developed precise methods for measuring angular positions of celestial bodies.
Quadrature creates the most dramatic shadows on the Moon's surface because sunlight hits at a low angle, making craters and mountains stand out in sharp relief! It's like having the cosmic equivalent of golden hour lighting for lunar photography.
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