BOOK I 



TaBLE Or CoNTENTS AND AuTH0RTTrE3 



Book 11. Contents : (i-iii) The world — is it finite ? 

 is it one ? its shape ; its motion ; reason for its 

 name. (iv) The elements. (v) God. (vi) The 

 planets— their nature. (vii) Eclipses, solar and 

 iunar. Night. (viii-x) The stars — their magnitude ; 

 astronomical discoveries. (xi) The moon's motion. 

 (xii-xvi). Motions of the planets ; theory of their 

 light ; causes of apparent recession and approach ; 

 general properties of planets ; reason for changes 

 of colour. (xvii) The sun's motion ; reason for 

 inequahty of days. (xviii) Thunderbolts, why attri- 

 buted to Jove. (xix) The stars — their distances 

 apart. (xx) Music from the stars. (xxi) Dimensions 

 of the world. (xxii, xxiii) Shooting stars. Comets ; 

 their nature, position and kinds. (xxiv) Identification 

 of stars — method of Hipparchus. (xxv-xxxv) Sky 

 portents — recorded instances : torches, shafts, sky- 

 beams, sky-yawning, colom-s of the sky, sky-flame, 

 sky-wreaths, sudden rings, prolonged solar eclipses, 

 several suns, several moons, dayhght at night, 

 burning shield; an unique sky-portent. (xxxvi) 

 Disruption of stars. (xxxvii) The ' Castores.' (xxxviii) 

 The air. (xxxix-xh). Fixed seasons. Rise of dog- 



diurna Detlefsen : dierum (dieruin<modo> Mayhoff). 



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