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An astronomer and his assistant observing Mercury, Venus and Jupiter from a roof top observatory in Paris

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An astronomer and his assistant observing Mercury,...

$Robert Stirling Newall's25 - inch refractor on a 'German' equatorial mounting$

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Robert Stirling Newall's25 - inch refractor on a '...

A small reflecting telescope mounted on a tripod

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A small reflecting telescope mounted on a tripod

The Crossley telescope, a 36-inch

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The Crossley telescope, a 36-inch

The siderostat of the horizontal telescope

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The siderostat of the horizontal telescope

The Crossley telescope, a 36-inch

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The Crossley telescope, a 36-inch

$Refractor on a 'German' equatorial mounting$

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Refractor on a 'German' equatorial mounting

A victim using a street telescope whilst a pickpocket steals from them in London

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A victim using a street telescope whilst a pickpoc...

Photograph of the Crossley telescope, a 36-inch

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Photograph of the Crossley telescope, a 36-inch

The interior of George Bishop's Observatory

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The interior of George Bishop's Observatory

The United States Naval Observatory, Washington

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The United States Naval Observatory, Washington

The interior of George Bishop's Observatory

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The interior of George Bishop's Observatory

Photograph of the Hooker telescope, a 100-inch reflecting telescope located at the Mount Wilson Observatory, California

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Photograph of the Hooker telescope, a 100-inch ref...

The interior of the Kuffner Observatory, is one of two telescope-equipped public astronomical observatories situated in Austria's capital, Vienna

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The interior of the Kuffner Observatory, is one of...

The Crossley telescope, a 36-inch

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The Crossley telescope, a 36-inch

$A refractor with a focal length of120 inches being used by Henry Lawson$

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A refractor with a focal length of120 inches being...

A small reflecting telescope mounted on a tripod

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A small reflecting telescope mounted on a tripod

$Giuseppe Piazzi's refracting telescope with achromatic lens built by Jesse Ramsden$

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Giuseppe Piazzi's refracting telescope with achrom...

The arrangement of lenses in Johannes Kepler's telescope

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The arrangement of lenses in Johannes Kepler's tel...

Frontispiece of Giuseppe Piazzi's catalogue of star positions

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Frontispiece of Giuseppe Piazzi's catalogue of sta...

The siderostat of the horizontal telescope

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The siderostat of the horizontal telescope

$Children looking at the night sky with a portable refractor$

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Children looking at the night sky with a portable ...

The arrangement of lenses in Galileo Galilei's telescope

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The arrangement of lenses in Galileo Galilei's tel...

Photograph of the interior of the Royal Observatory, Greenwich, an observatory situated on a hill in Greenwich Park, overlooking the River Thames

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Photograph of the interior of the Royal Observator...

The photographic telescope within the Paris Observatory

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The photographic telescope within the Paris Observ...

$A 23-inch refractor built by Alvan Clark$

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A 23-inch refractor built by Alvan Clark

$A refracting telescope built by Joseph von Fraunhofer$

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A refracting telescope built by Joseph von Fraunho...

A Newtonian telescope a type of reflecting telescope invented by the British scientist Sir Isaac Newton

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A Newtonian telescope a type of reflecting telesco...

The photographic telescope within the Paris Observatory

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The photographic telescope within the Paris Observ...

$A 23-inch refractor built by Alvan Clark$

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A 23-inch refractor built by Alvan Clark

An astronomer and his female assistant observing Mercury, Venus and Jupiter from a roof top observatory in Paris

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An astronomer and his female assistant observing M...

$A refracting telescope on an iron stand and fitted with a finder$

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A refracting telescope on an iron stand and fitted...

$Children looking at the night sky with a portable refractor$

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Children looking at the night sky with a portable ...

Pierre Janssen

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Pierre Janssen

The telescope of an observatory in Paris

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The telescope of an observatory in Paris

$The Craig telescope, a large telescope built in the 1850s, and while much larger than previous refracting telescopes$

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The Craig telescope, a large telescope built in th...

A street telescope in London

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A street telescope in London

An astronomer and his assistant observing Mercury, Venus and Jupiter from a roof top observatory in Paris

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An astronomer and his assistant observing Mercury,...

$The testing of glass for the 26-inch refractor built by Alvan Clark$

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The testing of glass for the 26-inch refractor bui...

A street telescope in London

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A street telescope in London

An astronomer and his assistant observing Mercury, Venus and Jupiter from a roof top observatory in Paris

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An astronomer and his assistant observing Mercury,...

Photograph of the interior of the Royal Observatory, Greenwich, an observatory situated on a hill in Greenwich Park, overlooking the River Thames

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Photograph of the interior of the Royal Observator...

An astronomer and his assistant observing Mercury, Venus and Jupiter from a roof top observatory in Paris

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An astronomer and his assistant observing Mercury,...

The exterior of the Paris Observatory

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The exterior of the Paris Observatory

The exterior of the Paris Observatory

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The exterior of the Paris Observatory

Better housing

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Better housing

Poster from the NYC Housing Authority

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Poster from the NYC Housing Authority

Hans Lippershey

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Hans Lippershey

Galileo's 1611 drawing of lunar craters

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Galileo's 1611 drawing of lunar craters

Air Raid Precautions: Set of 50 cards issued by WD & H0 Wills, Britain 1938

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Air Raid Precautions: Set of 50 cards issued by WD...