The Topographic Speculum are tables of positions used in the creation of Topocentric Houses.
The Topographic Speculum
This type of Speculum will be useful for astrologers who work with the Topocentric House System of A.P. Nelson Page and Wendel Polich. This system is very popular in South America. While this version contains some of the same information as the Speculum of General Coordinates the OA/OD column is NOT the same as the ordinary oblique ascension (OA) or descension (OD) shown with that part of the Speculum.
