The Michelsen Book of Tables combines two prior books, The American Book of Tables and The Koch Book of Tables, into one volume that contains tables for both Placidus and Koch house systems, Tables of Diurnal Motion to minimize math calculations, Time Zones of the World (names and hours from Greenwich), Solar-Sidereal Time Correction, Time Correction for Longitude log tables, Universal to Ephemeris Time Correction (Delta T), various interpolation tables and more.