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GIOVANNI DOMENICO CASSINI
GIOVANNI DOMENICO CASSINI
Genoa, Italy (1625 - 1712)
Giovanni Domenico Cassini was an Italian mathematician, astronomer, engineer, and astrologer. Cassini was an astronomer at the Panzano Observatory, from 1648 to 1669, professor of astronomy at the University of Bologna and became, in 1671, director of the Paris Observatory. Along with Robert Hooke, Cassini is given credit for the discovery of the Great Red Spot on Jupiter (ca. 1665). Cassini was the first to observe four of Saturn's moons, which he called Sidera Lodoicea. Around 1690, Cassini was the first to observe differential rotation within Jupiter's atmosphere.
 

Professional astronomers use large telescopes all over the world, and even in space. Most of the largest ground-based reflecting telescopes are concentrated in Hawaii, Chile, and the Canary Islands that take advantage of the dark skies and superior seeing conditions created by high elevations, dry and steady airflow, and great distances from city lights. You will also find large relfecting telescopes in the United States (California, Arizona and Texas among other states), South Africa, Russia, Australia, China and other countries. Check out this list of large reflecting telescopes with primary mirrors that range in size from 15 to 2.2 meters in diameter for one that might be located near you, or plan your next vacation to visit one.

To view the details of any telescope in this list, please click on the name of the telescope. You can also sort the telescopes, by clicking on the table headings.

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Telescope Location Country
Keck Mauna Kea, Hawaii USA 10
Keck II Mauna Kea, Hawaii USA 10
Hobby-Eberly Mt. Folwkes, Texas USA 9.2
Large Binocular Telescope Mt. Graham, Arizona USA 8.4
Subaru Mauna Kea, Hawaii USA 8.3
Gillett (Gemini North) Mauna Kea, Hawaii USA 8.1
MMT Mt. Hopkins, Arizona USA 6.5
Hale Mt. Palomar, California USA 5
Mayall Kitt Peak, Arizona USA 3.8
UKIRT Mauna Kea, Hawaii USA 3.8
AEOS Maui, Hawaii USA 3.67
Canada-France-Hawaii Mauna Kea, Hawaii USA 3.6
ARC Apache Point, New Mexico USA 3.5
WIYN Kitt Peak, Arizona USA 3.5
Starfire Kirtland AFB, New Mexico USA 3.5
Shane Mount Hamilton, California USA 3
NASA IRTF Mauna Kea, Hawaii USA 3
Harlan Smith Mt. Locke, Texas USA 2.7
Hooker Mt. Wilson, California USA 2.5
Sloan Digital Sky Survey Apache Point, New Mexico USA 2.5

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