Longitude Collection

Ptolemys Map of the World cA. D 150. (1912) Artist: Claudius Ptolemy
Ptolemys Map of the World cA.D 150. The Ptolemy world map is a map of the known world to Hellenistic society in the 2nd century AD

Greenwich Royal Observatory, Greenwich Park, London. The observatory was built by Christopher Wren (1632-1723) on the orders of Charles II with the aim of providing accurate navigation tables

The Royal Observatory, Greenwich, London. Flamsteed House, the Royal Greenwich Observatory, was built by Christopher Wren (1632-1723)

The Observatory at Greenwich, 1836. Flamsteed House, the Royal Greenwich Observatory, was built by Christopher Wren (1632-1723)

Nevil Maskelyne, English astronomer, (1836). Artist: E Scriven
Nevil Maskelyne, English astronomer, 1836. Maskelyne (1732-1811) was Astronomer Royal from 1765-1811. He was made a Fellow of the Royal Society in 1758

The Reverend Dr Nevil Maskelyne, English astronomer. Artist: E Scriven
The Reverend Dr Nevil Maskelyne, English astronomer. Maskelyne (1732-1811) was Astronomer Royal from 1765-1811. He was made a Fellow of the Royal Society in 1758

Nevil Maskelyne, fifth British Astronomer Royal, (1815). Artist: Page
Nevil Maskelyne, fifth British Astronomer Royal, (1815). Maskelyne (1732-1811) was Astronomer Royal from 1765-1811. He was made a Fellow of the Royal Society in 1758

John Harrison, English clock maker, 19th century. Artist: W Holl
John Harrison, English clock maker, 19th century. Harrison (1693-1776) designed and built the worlds first successful maritime clock

John Harrison, English clock maker, 1768. Artist: W Holl
John Harrison, English clock maker, 19th century. Harrison (1693-1776) designed and built the worlds first successful maritime clock

The Royal Greenwich Observatory, Flamsteed House, Greenwich Park, London, c1820. The observatory was built by Christopher Wren (1632-1723)

Nevil Maskelyne, English astronomer, 1804. Maskelyne (1732-1811) was Astronomer Royal from 1765-1811. He was made a Fellow of the Royal Society in 1758

Flamsteed House in Greenwich Park, London, late 17th century. Flamsteed House was designed by Christopher Wren on the orders of Charles II as a royal observatory

John Harrison, c1835. Artist: William Holl
John Harrison, c1835. Portrait of the English inventor and horologist wearing a wig. Harrison became famous for resolving one of the most problematic issues of his day - how to determine longitude

The Equatorial Armillary of Tycho Brahe, 17th century
The Equatorial Armillary of Tycho Brahe, built on the Danish isle of Huen to measure celestial latitude and longitude. This illustration is from Blaeus Le Grand Atlas of 1662

The equatorial armillary of Tycho Brahe, 16th century. Artist: Joan Blaeu
The equatorial armillary of Tycho Brahe (14 December 1546 - 24 October 1601), from Joan Blaeus Le Grand Atlas. Brahe built this on the island of Huen to measure celestial latitude and longitude

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