For, says he, because of the double epact that occurs on the 4th and 5th of April that lunation has only 29 days.
And there the moon is not seen in all the lunation, except in the second quarter.
The number 28 corresponds with the number of days in a lunation.
Now that lunation having commenced on the 3rd of December, and consisting of thirty days, will end on the 1st of January.
In fact, the year and the lunation are to one another very nearly in the proportion of 235 to 19.
So that in both these cases fever commenced in half a lunation after the contagion was received.
And there is not the moon seen in all the lunation, save only the second quarter.
The fever and eruption in the distinct kind take up another quarter of a lunation, and the maturation another quarter.
lunation is a term sometimes given to the moon's period from any definite phase round to the same phase again.