Making Sky Measurements
Locating objects in the sky often require estimating distances in degrees. There are several methods of making these measurements. One of the commonest is to hold the hand at a distance from your face. The little finger is about 1/2 degree; first three fingers are about 5 degrees; a closed fist is about 10; etc.
Here's a simpler way. Practice holding a metric ruler about 22 or 23 inches (57  cm) from your eyes. Each cm division is about 1 degree.  It's that simple.