Zenith sector

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An image showing 'Zenith Sector - George Graham 1727 (AST0992)'

An image showing 'Zenith sector. Bradley's 12.5 Zenith Sector by George Graham. Royal Observatory Greenwich, London.'

An image showing 'Plan of Bradley's Zenith Sector by George Graham. Plate XV. Fig.18 - View of Sector as mounted on spindle. AST 0992'

An image showing 'Bradley's 12.5ft Zenith Sector by George Graham. Royal Observatory, Greenwich, London. AST0992'

An image showing 'Bradley’s 12½-foot Zenith Sector Telescope by George Graham 1727 at Royal Observatory Greenwich'

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This telescope was constructed by George Graham in 1727 for Bradley's personal use in studying the parallax of the star Gamma Draconis. When he was appointed third Astronomer Royal in 1742, Bradley only agreed to bring this instrument to Greenwich after the Government paid him the princely sum of £45 for it. With it he discovered two major phenomena: the aberration of light and the nutation (wobbling) of the Earth's axis. It was used at Greenwich until 1837.

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Object Details

ID:	AST0992
Collection:	Astronomical and navigational instruments
Type:	Telescope
Display location:	Display - ROG
Creator:	Graham, George
Date made:	1727
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Overall: 3810 x 72 mm
Parts:	Zenith sector Zenith sector (Telescope) (AST0992.1)