Phases of the Moon In the simulation you are the Earth, the ball is the moon and the light source is the Sun. Now to make it simulate the real thing, remember that the Sun is roughly 400 times farther away than the Moon. So the ball is right in front of your face and the light source is across the room. The shadow line is the line separating the lit portion of the "moon" from the dark portion. In order to get the rise, set, and transit times, do this. On the drawing label the Earth with a 24 hour clock. Where would noon be? Midnight? Now to get sunrise and sunset correct, note that the Earth rotates counter- clockwise in the drawing. For a given lunar phase, start by placing yourself on the Earth directly underneath that particular moon. That is, draw a line from the moon to the center of the Earth. The moon would appear high in your sky and would be transiting. What time is it? If that is transit, then the moon rose a quarter of a day before that and will set a quarter of a day after that time. Also use the following conventions to talk about time. Refer time to the position of the Sun. For example, if you find a particular phase transits at sunset, say sunset, not 6 PM. Also, From Call ______________________________ Sunrise - Noon morning Noon - Sunset afternoon Sunset - Midnight evening Midnight - Sunrise night It makes grading much easier if we all use the same terminology.