Chapter 1
The First Moon: The Clock in the Sky
The first task is to learn what the full moon is doing.
At full moon, Earth is positioned roughly between the Sun and Moon. The side of the Moon facing us is almost completely illuminated by sunlight. This geometry explains the rhythm of the night. A full moon rises around sunset, reaches its highest point around midnight and sets around sunrise.
The times are approximate. Your latitude, the season and the Moon's exact position all make a difference. Yet the pattern is reliable enough to become a clock. If the bright Moon is climbing in the east, evening has begun. If it is high, the night is mature. If it hangs low in the west, dawn is approaching.
The Moon completes a cycle of phases in about twenty nine and a half days. Astronomers call this the synodic month, the interval from one new moon to the next, or from one full moon to the next. The Moon takes less time, about twenty seven and a third days, to orbit Earth relative to the distant stars. The difference occurs because Earth has also moved along its orbit around the Sun. The Moon must travel farther to return to the same Sun lit geometry.
This first observation should be simple. Find the eastern horizon before moonrise. In a Malaysian town, that might mean a gap between apartment blocks, an open field, the shore, or a high car park. Check the expected rise time, then arrive early.
