Celestial navigation course

Introduction to celestial navigation

Sextant Chronograph

A useful accessory

Star astimatizing lens

Star astimatizing lens

The vernier

How to read the vernier

Schüler double prism

Schüler double prism

Combined dip and index error adjustment

Combined dip and index error adjustment

Sextant mirrors

Sextant mirrors

Construction of a sextant

Construction of a sextant

Sextant frame

Sextant frame