📚 noun • entry_id 50892
armill
/ˈɑːmɪl/
Meanings (ES + gloss)
armilla
An ancient astronomical instrument, having either one ring placed in the plane of the equator for determining the time of the equinoxes (an equinoctial armil) or two or more rings, one in the plane of the meridian, for observing the solstices (a solstitial armil).
The Armill, Astrolabe, Dioptra, and Parallactic Instrument of the ancients were some of the instruments thus constructed.
This instrument was called an equinoctial armil. Observations taken in this manner must necessarily be very inaccurate, owing to the refraction.
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