I Great and Small Circles II Spherical Triangles III Spherical Geometry IV Relations between the Trigonometrical Functions of the Sides and the Angles of a Spherical Triangle V Solution of Right-angled Triangles VI Solution of Oblique-Angled Triangles VII Circumscribed and Inscribed Circles VIII Area of a Spherical Triangle. Spherical Excess IX On certain approximate Formul X Geodetical...