I think every astrologer knows that there is a Placidean house system. Some of astrologers are informed that Placidus is not the inventor of this house system. Few astrologers heard that Avraham Ibn Ezra wrote about this system five centuries before Placidus. But much less number of astrologers know what and where Ibn Ezra really wrote.
Ibn Ezra really described the house system that is based on the hour distance of the point of ecliptic from the meridian. And it is really the same basic idea as in Placidean house system.
Ibn Ezra describes this system in his ספר הטעמים א (The Book of Reasons A). A is important in this case, because there are two versions of The Book of Reasons – version A and version B. Version A is more than twice bigger than version B. But the English translation of The Book of Reasons by Meira Epstein is based on the version B. Therefore English speaking readers are bereft of some very interesting and important parts of this Ibn Ezra’s work, including the part on house system.
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