De morborum temporibus, Principum Medicorum Aphorismoi

10. Those not-accurately acute, or those in the μεταπτώσεως critical change at 17, 20, 21, or in the μεταπτώσεως from 21 to 40, are called τροπικοὶ solstitial/turning: likewise 60, 100, 120, which, however, because they progressed from the beginning with slow motion, are called χρονοὶ chronic.
11. By days, I understand medical days, which are shorter than common days. For 6 and 17 1/2 hours of these make a medical week.
12. For the medical month is made from the periodic and illumination months, divided in half.
13. Therefore, according to Galen, neither the month of appearance nor the συνοδικὸς synodic month is rightly held as the medical month by common practice. Valleriola, book 3, chap. 7; Fuchs, book 4, sect. 2, chap. 10; Fernel, consil. 53.
14. Chronic diseases have the first limit of κρίσις crisis at the 40th day: after this, months and years.
15. Acute diseases have a short limit of κρίσις, since they bring evils quickly, and nature is forced to fight with the disease quickly, and those who are weaker succumb.
16. Diseases are intercepted, and those who are to die necessarily die in an odd year, month, and day.
17. Odd years are κλιμακτῆρες climacterics: these are either greater and true, that is, numbered by 7, such as 49, 56, 63, 70, 77, 84, or lesser, and the ἐπίδυμοι accompanying/minor ones of the greater, which are intermediate to the septenaries, such as 45, 81, etc.
18. The author in 14 Metaphysics has sufficiently refuted the opinions of the Pythagoreans and Platonists regarding the number seven: and according to Galen, any number can be praised or vilified with cold arguments.
19. Nor do we ascribe the power of Climacterics to the planets: but since both ages and Climacterics are divided by the number seven, it happens that the great and manifest changes made in ages are said to occur in these years.

The four parts of universal time are also called universal times, being ὁμώνυμα homonymous to the former ones.
1. Of these, the beginning, augmentation, and status are called the constitution. The beginning, however, is alone called the principiate.
2. To the beginning belongs Hippocrates’ τὸ αὐτίκα that which is immediate, that is, the space of three days, during which the Egyptians ordained that if a physician were to do anything, he should do it at his own risk. 3 Polit. 5.
3. Yet the beginning is not always three days, as the Diatritarii those who treat by three-day cycles wanted.
4. Not because a fever is ὁμοτόν constant in tension does it lack these times.
5. Only an unhealthy disease has a beginning, when due to the signal vehemence of the disease and the extremely weak vitality, death occurs in the beginning.
6. The beginning of a disease is to be estimated not from the decubitus, but from the need for decubitus.
7. The beginning of a fever (whether intense or remiss) invading after the seventh day post-partum has elapsed must be counted from the hour of the fever.