hanging on a lyne heyer than thin heved on a perche; and thilke
lyne mot hange evene perpendiculer by-twixe the pool and thyn
eye; and thanne shaltow seen yif A sitte evene over the pool and
30
over F at evene; and also yif F sitte evene over the pool and
over A or day. And for more declaracion, lo here thy figure.
[24.] Another conclusioun to prove the heyghte of the pool artik fro the orisonte.
[Alia conclusio ad probandum altitudinem de polo artico ab orizonte.]
Tak any sterre fixe that nevere dissendeth under the orisonte in
thilke regioun, and considere his heyest altitude and his lowest