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physical object > artifact > device > instrument > telescope > electromagnetic telescope > Earth based telescope > equatorial telescope > English equatorial telescope > 28-inch Visual Refractor

28-inch Visual Refractor (Greenwich refractor)
subject			fact

28-inch Visual Refractor	has comment Dome under repair in 1992
	has mounting manufacturer Ransomes and Sims
	has longitude 00° 00'
	has latitude 51° 29' N
	has lens maker Gmbh
	has aperture 0.711 m
	has focal ratio f/11.9
	has synonym Greenwich refractor
	has altitude 47 m
	has owner Old Royal Observatory
	has creation date 1894
	has location Greenwich, London, England
	is an instance of refractor
	is an instance of English equatorial telescope
English equatorial telescope	has mounting English equatorial
refractor	has lens type doublet
	has optical design visual refractor
optical telescope	has reference astroweb
Earth based telescope	has temperature ambient
telescope	has wavelength sensitivity
	has angular resolving power
	has effective diameter
	has operator
	has purpose observe celestial objects
artifact	has creator
physical object	has angular momentum
	has mass
	has velocity
	has momentum
	has volume
	has extent
	has material

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