Observing basics
侧视法
Averted vision
Looking slightly off-target to use rod-rich retina.
It can gain about one magnitude.
Related terms
- Azimuth — Horizontal angle measured clockwise from north.
- Zenith — The point straight overhead, altitude 90°.
- Meridian — The great circle from north through zenith to south.
- Conjunction — Two bodies appearing close together on the sky.