COMPENDIOSA.

are completed in 365 days, with the fourth part of one added, by the incitement of the first mobile, which yields the same number of days.

We call a natural day that duration of time which is interposed from the rising of the Sun until it has brought back the same description of the sky at long intervals, and has returned to the same rising from whence it had set out.

The fourth part of the day, which contains 6 hours of time, composes a natural day every fourth year, which they call "Bissextile" original: "Bissextilem"; Leap Day in diaries, because by intercalating this day on the sixth day before the Kalends of March, we repeat the days, counting two under the same letter, which day, according to the old Roman custom of counting, is called "twice the sixth of the Kalends." For this reason, this day is commonly called Bissextile, which, according to our custom of counting days, is the 24th day of February.

The Moon, wandering through the twelve signs in the same spaces, does not mark for us any difference of seasons as the Sun does, but shows itself in diverse forms. For established under the Sun, in the same sign whichever it may be, it appears as "New," as we are accustomed to say. And having followed this journey toward the east, in the space of 28 days having been completed, it traverses three signs of the Zodiac in seven days. And so, as often as it has receded from the Sun by a fourth part of the Zodiac, it is commonly said to be "Waxing"; it is called by the Greeks dichomenos half-monthly and dichotomos cut in two. But six whole