If this is the right interpretation of the passage, we may say at once that Dante’s astronomical data are imaginary, for the moon was not full on the night preceding either of these dates, but on March 5, and April 4: Saturn was indeed in Leo, but Venus was so near the Sun as to be invisible in March, and began to appear as an evening star in Taurus on about the 9th of April. These positions were all carefully calculated by Prof. Angelitti, who is a professional astronomer as well as a Dante scholar; and he made the thrilling discovery that the positions agree wonderfully well for the year 1301! In this year the moon was full on the early morning of the 25th of March; Venus entered Pisces three days later, and was a morning star, near her greatest elongation west, and very brilliant; Saturn was not only still in Leo but was just three degrees west of Regulus; and Mars was also in Leo. If the anniversary of the Crucifixion means Good Friday, the day would be March 31 in 1301, and the moon would be wrong, but March 25 has some claims to be considered the more probable date. A fixed calendar date is more appropriate to use for calculating an exact number of years than a changing festival, which might rather be regarded as an “ideal date.”[533] Moreover, March 25 is suggested by the allusion to the Creation in the opening Canto; this day was also the traditional date for the spring equinox,[534] and it was one of the most important days in the year to Florentines, being their New Year’s Day as well as Lady Day. ------------------------------------------------------------------------ [533] Moore, _Studies in Dante_ iii. p. 146. [534] See p. 177. ------------------------------------------------------------------------ We know that the idea of writing his great work was in Dante’s mind even when he wrote the last words of the _Vita Nuova_,[535] and we need only suppose that he was thinking of it when he looked at the sky on the evening before Lady Day in 1301, that he saw the full moon, and the two bright planets Mars and Saturn making a striking asterism with Regulus; also that in the early dawn about the same time he rejoiced in the sight of Venus veiling the Fishes in the east. ------------------------------------------------------------------------ [535] _V. N._ xliii. 1-11. ------------------------------------------------------------------------ But is this attractive theory admissible? Can we take Dante’s words elsewhere as referring to the year 1301?