Alidade
= Alidade
{wiki}
A sighting rule used to measure a direction or angle. On a conventional <astrolabe>, it rotates over the back's angular scale; it is distinct from the front rule used to read the projected sky geometry.
= Alidade
{wiki}
A sighting rule used to measure a direction or angle. On a conventional <astrolabe>, it rotates over the back's angular scale; it is distinct from the front rule used to read the projected sky geometry.