Measuring and Computing
The visual angle can be measured directly using a theodolite placed at point .
Or, it can be calculated using the formula, .
However, for visual angles smaller than about 10 degrees, this simpler formula provides very close approximations:
Read more about this topic: Visual Angle
Famous quotes containing the word measuring:
“We recognize caste in dogs because we rank ourselves by the familiar dog system, a ladderlike social arrangement wherein one individual outranks all others, the next outranks all but the first, and so on down the hierarchy. But the cat system is more like a wheel, with a high-ranking cat at the hub and the others arranged around the rim, all reluctantly acknowledging the superiority of the despot but not necessarily measuring themselves against one another.”
—Elizabeth Marshall Thomas. “Strong and Sensitive Cats,” Atlantic Monthly (July 1994)