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[Phys-L] Percent of Sun Covered Duing Eclipse



Here in Baltimore one of the weather stations announced our partial eclipse
would be 88% at maximum (3:02 pm EDT).  At this time, the sky did grow
darker, but not as dark as I expected given an 88% eclipse.  Was the weather
report wrong, or is the amount of sunlight received by a spot on the earth
not directly proportional to the amount of the sun's disk visible at that
spot?  I am ignoring secondary effects such as the sun's corona.

Don Polvani retired physicist, engineer