Description

This program illustrates how the appearance of the Moon changes over the course of a synodic month of 29.5 days. The specific named phase and the Moon's "age" are also shown.

Explorations

What phase is a 4-day-old Moon? What phase is a 18-day-old Moon? What phase is a 26-day-old Moon? About how many days are there betwen New and First Quarter, First Quarter and Full, Full and ast Quarter, and Last Quarter and New?