pinnula , auch: pinnule

Pointing the compass pinnula to the star (sun or moon)

The location of the horizon mirror and telescope or sighting pinnula is lower.

For that reason, most early octants employed a simple naked-eye sighting pinnula instead.

These dispensed with a telescopic sight, using a single- or double-holed sighting pinnula instead.

The pinnula (sighting vanes) may then be pointed to a terrestrial object and its bearing read from the angle scale.

The term pinnula is the Latin diminutive of pinna; either as such or in the Anglicised form: pinnule, it is differently defined by various authorities.