Knappich remarked on the calculation of Walter Koch's system (Heinz Specht and Friedrich Zanzinger were the actual creators, with whom he was friends), that one had rightly accused the Placidus system and its precursors that the semi-arc above the earth is of a different size as the semi-arc under the horizon and frankly admits that precisely this difference corresponds with the actual movement pattern of the semi-arcs.
In the twenties and thirties of the twentieth century Erich Kühr and Walter Koch continued this dispute in Germany, a dispute between Regiomontanus and Placidus followers that was recorded in 18th and 19th century England as ultimately in favor of the Ptolemaic method. And also by publishing his Tables of Houses with fully calculated house cusps he ensured a wide dissemination of this method.' Regiomontanus In it, he also constructed house tables in the Ptolemaic way, of which the results were similar to that of Placidus.' Knappich further on: 'Therefore Placidus had many forerunners and exponents of the 'Ptolemaic Method' at the time and his contribution was only that he gave this method a completely new philosophical foundation.
Hilarius Altobelli also made a critique of the then known house systems in his 'Tabulae Regiae divisorum duodecim partium coeli ad mentem Ptolemaei' (1628). Knappich: 'After Magini another Italian astrologer P. The Italian monk and mathmatician Placidus de Titis (1603-1668) is erroneously considered to be the 'Founding Father' of this system. The essential idea is that the conditions laid out by Ptolemy for the Primary Directions are also used to formulate and calculate the so-called Placidus House System. The mathematical foundations for the house system that is most popular today, were first calculated and formulated by the astronomer, mathematician and cartographer Giovanni Magini.
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