Full text: de Sacrobosco, Johannes: Sphaera Ioannis de Sacrobosco

14. .III.
Ambitum terræ, & ex eo Diame-
trum inuenire.

TOti{us} autem Orbis terræ ambit{us} authori-
tate Ambroſij, Theodoſij, Macrobij, & E-
ratoſthenis Philoſophorum. 252000. ſtadia
cont{in}ere diffinitur, vnicuique quidem. 360. par-
tium Zodiaci. 700. ſtadia deputando. Sumpto enim
Aſtrolabio vel Quadrante {in} ſtellatæ noctis claritate
per vtrunque medicl{in}ij foramen, polo perſpecto, no-
tetur graduum multitudo, {in} qua ſteterit medicl{in}i¤ũ¤¤um¤¤¤context¤¤¤¤. De{in}de procedat Coſmimetra directé verſ{us} ſepten-
trionem à meridie, donec {in} alteri{us} noctis claritate,
viſo vt pri{us} Polo,
ſtatuerit alti{us} vno
gradu medicl{in}ium. Poſt hoc menſuretur
hui{us} it{in}eris ſpacium ſpaciũ,
& {in}uenientur. 700. ſtadia. De{in}de datis
vnicuique. 360. gra-
duum, tot ſtadiis ter-
reni orbis ambit{us} {in}-
uent{us} erit.

14.1.

0025-01

Ex his autem, iuxta circuli & diametri Regu-
lam, Diameter terræ ſic {in}ueniri poterit, Aufer vi-
geſimam ſecundam partem de circuitu terræ, & re-
manentis tertia pars, hoc est. 80 181. ſtadia & ſemis,

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