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The great brass sextant of Johannes Hevelius, portrayed here
observing with his second wife Elisabetha. Six feet in radius,
this instrument was closely modeled on
Tycho's great sextant.
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Hevelius' azimuthal quadrant. An ingenious system of counterweights
allowed a single observed to manipulate the instrument while taking
readings.
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Bibliography:
Hevelius, J. 1647,
Selenographia: sive, Lunae Descriptio [Facsimile, Johnson
Reprint Corporation, New York, 1967].
Hoskin, M. 1997, The Cambridge Illustrated History of Astronomy.
Hevelius
Tycho
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