Critical Note 18

Critical Note 18
§3, ll. 31, 32. A has 12: degres, corrected to 18 degres; B. has 12 degrees; C has 18. The numbers in the MSS. in these propositions are somewhat uncertain; it seems probable that some alteration was made by Chaucer himself.

The readings in MS. B give one set of calculations, which are no doubt the original ones; for in MS. A the same set is again found, but altered through-out, by the scribe who drew the diagrams. The sets of readings are these:
L1. 31, 32. 12 degrees B; so in A, but altered to 18; C has 18.