"Normalization allowed us to imitate the pattern of lucky and unlucky days, although we did not know the rules that were used to choose them. It gave us the Q⋆estimates and eliminated some of the unreal periods. The best idea of all was to test what happens after removing . This resulted in the 2.d850 period being the only signiﬁcant real period and its signiﬁcance increased. CC does not give explicit clues as to why AES assigned the prognoses with such regularity, but the period differs by from the current orbital period of Algol. If this is indeed the reason for ﬁnding this periodicity in CC, then should have increased about since 1224 B.C."