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SHORT-FOCUS TELESCOPE, 1881.

Lawson's telescope, 1853

HEVELIUS' TELESCOPE.

HEVELIUS' TELESCOPE.

GALILEO'S TELESCOPES

OBSERVATORY, 1860.

GEORGE ELLERY HALE

Janssen at Meudon Observatory, 1893

William Tulley, British optics maker

Markree Observatory telescope

Paris Observatory telescope

A Newtonian telescope.

NEWTON'S TELESCOPE.

An astronomer and his assistant observing Mercury, Venus and Jupiter.

An astronomer and his assistant observing Mercury, Venus and Jupiter.

An astronomer and his female assistant observing Mercury, Venus and Jupiter.

Pierre Janssen.

Image taken with an early 19th Century telescope of Nebulas.

TELESCOPE: PARSONS, 1845.

Paris Observatory, 1829

William Herschel's giant telescope.

Astronomers making telescope observations in Africa.

Astronomers making telescope observations in Africa.

A telescope built by Joseph von Fraunhofer.

A telescope built by William Herschel.

Lord Rosse's 3-foot telescope, Ireland

GALILEO GALILEI (1564-1642)

Jesse Ramsden, English instrument maker

DAVID RITTENHOUSE

Galileo demonstrating his telescope.

TELESCOPE, 19TH CENTURY.

Smyth's parallactic ladder mount

Galileo Galilei, Italian astronomer

25-inch Newall refractor telescope, 1873

ASTROLOGER.

30-inch telescope, Helwan, Egypt

Herschel's 40-foot telescope, 1789

A spiral galaxy.

A spiral galaxy.

A spiral galaxy.

A spiral galaxy.

An astronomer and his assistant observing Mercury, Venus and Jupiter.

An astronomer and his assistant observing Mercury, Venus and Jupiter.

Solar observations using a refracting telescope.

Galileo Galilei, Italian astronomer

1636 Galileo Galilei portrait astronomer

Jean Dominique Cassini (1625-1712)

Observatory of Strasbourg

Astronomer

Astronomer

David Rittenhouse, US astronomer

Telescopic view of Mars based on William Herschel's observations.

A small refractor mounted on a wheeled frame.

A 23-inch refractor built by Alvan Clark.

A 23-inch refractor built by Alvan Clark.

The testing of Glass for the 26-inch refractor built by Alvan Clark.

A refractor with a focal length of 120 inches being used by Henry Lawson.

Robert Stirling Newall's 25 - inch refractor.

Animals watch The Great Comet of 1861.

Ancient astronomers.

Hartwell Observatory, 19th century

Ancient astronomer using 'sighting tubes' to observe the sky.

Henry Parkhurst, US astronomer

James Nasmyth, Scottish engineer

Norman Lockyer.

Norman Lockyer's solar spectrograph.

Norman Lockyer's solar spectrograph.

WARREN DE LA RUE (1815-1889).

Female American mathematician and astronomer at work, at the Paris Observatory.

Giant Magellan Telescope

English astronomer, 19th century

Hevelius observing with a telescope

Paris Observatory in 1868.

Newtonian telescope, 19th century

Doppler redshift astronomy, illustration

SOLAR ECLIPSE, 1860

MARIA MITCHELL (1818-1889).

James Gregory

Carl August von Steinheil, 1801 1870

FERDINAND VERBIEST

Engraving of Joseph Norman Lockyer.

JOHN FLAMSTEED, c1700.

Solar observatory

REFRACTING TELESCOPE, 1888.

Sir Norman Lockyer.

Telescope, Durham University

Astronomer using a telescope

Astronomer using a telescope

Astronomer using a telescope

1689 Sir Isaac Newton portrait young

Nicholas Kratzer, German astronomer

Messier marathon, Iran

Messier marathon, Iran

Arnold Wolfendale, British astronomer

Giuseppe Piazzi's refracting telescope with achromatic lens.

Paris Observatory foundation, 1667

The telescope of an observatory in Paris.

Astronomer

Astronomer

David Levy

Frontispiece of Giuseppe Piazzi's catalogue of star positions.

JEAN DELAMBRE (1749-1822).

PIERRE-SIMON de LAPLACE

KARL FRIEDRICH GAUSS

JOHANNES HEVELIUS.

JOHANNES HEVELIUS

SIR WILLIAM HERSCHEL

William Herschel (1738-1822)

Astronomical Occultation

Alexis Bouvard, 1767 1843

TELESCOPE: WILLIAM PARSONS.

TELESCOPE: PARSONS, 1845.

Telescope stars, conceptual illustration

Telescope stream, conceptual illustration

Telescope in Moonlight

Jodrell Bank radio telescope

18th Century astronomer, artwork

Fritz Cohn, German astronomer

Herbert Couper Wilson, US astronomer

John Adelbert Parkhurst, US astronomer

William Joseph Hussey, US astronomer

Benjamin Peirce, US mathematician

Seth Chandler, US astronomer

Benjamin Gould, US astronomer

Camille Flammarion, French astronomer

Edward Sabine, British astronomer

BAAS meeting, Southampton, 1846

George Airy, British astronomer

Christiaan Huygens, Dutch physicist

John Herschel, British astronomer

John Frederick Herschel, English astronomer and scientist

Fine Guidance Sensor

James Webb Space Telescope mirror

Galileo Galilei, Italian astronomer

Galileo Galilei, Italian astronomer

SAMUEL PIERPONT LANGLE

SAMUEL PIERPONT LANGLEY

SAMUEL PIERPONT LANGLEY

SAMUEL PIERPONT LANGLEY

CURBSTONE ASTRONOMER, 1872

Great Equitorial Telescope, Greenwich

JAMES GLAISHER (1809-1903).

Isaac Newton (1642-1727)

Samuel Pierpont Langley's first steam powered plane model.

Hevelius's book on comets, 1668

Comet Donati as seen in Paris.

GALILEO GALILEI (1564-1642).

BINOCULAR MICROSCOPE.

The arrangement of lenses in Galileo Galilei's telescope.

FRIEDRICH WILHELM BESSEL

ANDERS JONAS ANGSTROM (1814-1874).

J.F. WILLIAM HERSCHE

KARL FRIEDRICH GAUSS

PIERRE-SIMON de LAPLACE

HOLBEIN: ASTRONOMER, 1528.

PERCIVAL LOWELL

SIR WILLIAM HERSCHEL

PERCIVAL LOWELL

SIR WILLIAM HUGGINS

JULES JANSSEN (1824-1907).

JULES JANSSEN (1824-1907).

JOHN HERSCHEL (1792-1871).

JOHN HERSCHEL (1792-1871).

JOSEPH LALANDE (1732-1807).

JOSEPH LALANDE (1732-1807).

WILLIAM HUGGINS (1824-1910).

SIR JOHN F.W. HERSCHEL

PERCIVAL LOWELL (1855-1916).

JOHN F.W. HERSCHEL

KARL FRIEDRICH GAUSS

THE EQUATORIAL TELESCOP

Nicolas Copernicus (1473-1543)

GALILEO GALILEI (1564-1642).

Stargazing

Amateur astronomers

Isaac Newton, English physicist

HIPPARCHUS (146-127 B.C.).

Giuseppe Piazzi's Palermo Circle.

15-inch telescope, Edinburgh Observatory

15-inch reflector telescope, 1887

Astronomer on a white background, vector illustration

Richard Anthony Proctor.

Carl Friedrich Wilhelm Peters.

Measuring the size of the Earth, 1671

NEVIL MESKELYNE (1732-1811).

NICOLAUS COPERNICUS

TYCHO BRAHE (1546-1601).

Northumberland Telescope diagram

A Brewster Stereoscope.

A Brewster Stereoscope.

William Huggins' stellar spectroscope.

GALILEO'S MICROSCOPE.

Polish Astronomer Nicholas Copernicus.

Probable variations in the features of Lockyer's sea.

1848 Portrait of Caroline Herschel colour

1848 Portrait of Caroline Herschel colour

1848 Portrait of Caroline Herschel

Mary W. Whitney, US astronomer

Maria Mitchell, US astronomer

Maria Mitchell, US astronomer