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Liber

11

l.

hoci!l\ontem deprc!fus

18

gradibus , hoc efr,

lit

arcus

DE

grad. 18 • incclligttUI

linea~

Sole du-

8:a , quz terram tangzc in

H ,

h:r:c cric puallela

linez

C F ,

propter immcnfam Solis

a

cerra

ái,–

fianriam ,

&

cum Sol

ex

utráque parce quadran–

tem illuminet, cric

EH

quadrans,

&

arcus

ED,

AH

grad.

18.

Ell ergo arcus

AH,

graduum

18,

funt

aurem

B H , B A

zquales ,

&

arcus

AOj

O H

zquales , quarc arcus

AO

ell

9.

graduum

1

quzritur linea

O B,

quz el\ exccílhs fecaoris

C B ,

fupra cadium

C O ,

quzte

in

tabula fe–

cantium excelfum illum fccantis fupra radium,in–

venies

114651.

qualium radius eft

100000001

Si ergo fiat ut radius ad

1146

5

1.

ita

radius

ccrrz

in milliaribus nempe circicer

3

600.

ad

. quarcum, invmiéfque

4+

milliaria , ad quz pro–

tenduntur halicus rcflcxivi luminis.

~od

qui!!"

tebacur.

F l

~/

S

'T

O

M l

'TE R 'T1 l.