Vitruvius, De architectura libri decem, 1567

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336304LIBER lum, quandoque parabolem, interim hyperbolem, aut demum Ellipſim. Soligitur aut in æquinoctiali cir-
culo, aut extra inuenitur.
ſi æquinoctialem circulum ambit, & radijs gnomoneẽ feriat,rectam in quocunq; pla
no lineã umbræ deſcribet, ideo in omnibus horologiorũ planis æqualibus æquinoctialis umbra per directam li-
135[Figure 135]A. ſectio parabole.
B. vestigium. C. parabole.
G. ſectio ellipſis.
D. ſectio hyperbole.
E. vestigium F. hyperbole.
a f a f 1 f f f 1 2 1 1 2 3 2 2 3 4 3 3 4 5 4 4 5 6 C 5 5 6 F 7 A 6 6 8 7 8 7 7 D 8 9 8 8 9 10 11 10 10 11 11 11 11 b 12 g e d b e h d g
f g b 6 7 3 1 2 4 6 8 10
c g b E a 11 9 7 3 3 1 d 2 4 6 8 10 e h
a f 1 2 3 4 5 6 7 8 9 10 11 a b c d 9 8 7 6 3 2 1 f b a H d g 10 9 8 7 6 5 4 3 2 1 f
f 1 2 3 4 5 6 7 8 9 10 11 g
neam deſignatur.
ratio est quoniam gnomonis apex eſt in æquionctialis plano, ideo gnomonis umbræ ab eo
plano mimme diſcedent æquinoctij tempore,&
propterea ideo a communi ſectione illius plani, & horarij ter-
minabuntur.
quemadmodum experiundo diſces. Sole igitur æquinoctialem circulum ambiente & ad apicem
1160

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