Observing basics
透明度
Transparency
How well the sky passes starlight, set by water vapour and dust.
A visible Milky Way usually means a limiting magnitude of 5 or better.
Related terms
- Sidereal day — One rotation relative to the stars, about 4 minutes short of a solar day.
- Solar eclipse — The Moon covering the Sun.
- Lunar eclipse — The Moon passing into Earth's shadow.
- Zodiacal light — Sunlight scattered by interplanetary dust, a faint cone.