midnight
At the coming of the cry , he arose , and observed the heavens intently ; then he shouted , ` There is no God but God ! Lo , Mars , Lord of the Ascendant -- Mars , with his friends , Saturn , Venus , and Jupiter in happy configuration , and the moon nowhere visible . Hail the Prince ! ' And while his answer was passing below , the man on the roof marked the planets in their Houses exactly as they were that midnight between Monday and Tuesday in the year 1430 . Have I in aught erred , my lord ? '' `` In nothing , O Prince . '' `` Then I proceed ... .