The first book of astrology that has described the art of rectification of the birth time of a person was
TETRABIBLOS of Ptolemy or Claudius Ptolemaios released.
His method of rectification was
a system to compare the Ascending degree at the birth moment with comparison to the immediate
before New Moon or Full Moon that was observed. This method is abandoned now as the famous
astrologer Jerome CARDAN (1501-1576) has failed to predict the recovery of disease of the king
Edward 6th in missing to find the ASC of the king by using the system of Ptolemy explored.
Unfortunately the king died young at the age of sixteenth.
のテトラビブロスです。この方法は、人物の出生時のＡＳＣ値と直前の新月または満月の度数比較に
よる修正方法ですが、現在では使用されていません。１６世紀の著名な占星学者・カルダンがトレミーの
修正方法で英国王のエドワード６世の出生時刻を修正して王様の病気を判断しましたが、結果を誤って
王様は１６歳で若死にしました。