༺♥༻ Charlene Cleo Eiben # 2༺♥༻
Oxford's Museum of the History of Science
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.
Celestial sphere. European celestial globe (view 2), 1878. This globe features beautiful constellation figures such as Taurus the Bull and Aries the Ram. The star patterns are the reverse of what we see in the night sky, because many celestial globes depict the sky as if you were outside a sphere, looking down.
EQUAL & OPPOSITE – Blog
The Heavens without a Telescope. Vintage Star and Planet Finder providing some great design inspiration. “Directions: Revolve the map until the day of the month desired stands opposite the hour of the day you wish, and that portion of the map showing within the opening, will present the stars and planets in view at that hour. Hold the map over your head—the top north—and you will see the stars just as they appear in the heavens.”