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| Keywords: EB1711 Armillary Sphere.png The components of the armillary sphere are labeled ; A equinoctial ring showing the sun's ascension ; b north pole nut holding sun Ψ ; B ecliptic ring showing location of the sun on a specific day of a month ; C tropic of Cancer ; d pin holding moon Ζ ; D tropic of Capricorn ; e where tropic of Cancer touches ecliptic ; E arctic circle ; f where tropic of Capricorn touches ecliptic ; F antarctic circle ; G equinoctial colure ; H solstitial colure ; J terrestrial globe ; K terrestrial axis ; L flat celestial meridian ; M movable horizon ; n terrestrial north pole ; N celestial north pole ; N pedestal ; O joint ; P arc of joint O 0 to 90 degrees ; Q brass arm ; r elevation screw ; R upright piece ; s terrestrial south pole ; S celestial south pole ; T box ; U 1st of 2 axes of wheels for T earth turns ; V 2nd of 2 axes of wheels for T sphere of circles turns ; W winch ; Ψ sun ; Ζ moon Armillary sphere from Plate LXXVII Encyclopedia Britannica 1771 PD-old-100 PD-Britannica Armillary spheres | ||||
