The distance between the tip of your thumb and the tip of your middle finger is about 15 degrees. Star Field - If you look closely at the sky chart you may recognize familiar constellations. This should help you locate the satellite rise and set positions. The sky chart also shows colored dots for the planets, moon, and sun. The relative brightness of the stars is shown by the size of the dot drawn.
Bright stars appear larger on the sky chart than dim stars.
Date and Time - The date and time for the beginning of the satellite pass are displayed in the upper left corner of the sky chart. Astronomical magnitude measurements are the opposite of what most people would expect. That is, a magnitude 1 is brighter than a magnitude 5. A magnitude of 0 is a valid value, and is brighter than magnitude 1. For objects even brighter, the scale continues into negative numbers, and some of the brightest satellites may be a -1.