What is the standard range for the Sun's altitude measurement when it is visible above the horizon?
Answer
$0^ ext{o}$ (horizon) to $+90^ ext{o}$ (zenith)
Altitude describes the Sun's height above the horizon. It ranges from $0^ ext{o}$ when the Sun is exactly on the horizon (sunrise or sunset) up to $+90^ ext{o}$ when it is directly overhead at the zenith.
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