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Arago medallion near the Louvre pyramid. In his "Hommage à Arago," commissioned as a memorial to François Arago (1786-1853), Jan Dibbets set over a hundred of these bronze medallions into the ground along the Paris Meridian from the southern to the northern boundaries of the City. Each of them is 12 cm in diameter, with Arago's name and showing north and south. (Photo credit: Poulpy) Mona Evans, "Full Meridian of Glory - book review" http://www.bellaonline.com/articles/art181703.asp

Hommage à Arago? Jan Dibbets made 135 bronze medallions to lay in various places along the Paris Meridian as a memoral to François Arago (1786-1853), (Credit: océane lesgourgues) But WHY is Arago's name misspelled here? Mona Evans, "Full Meridian of Glory - book review" http://www.bellaonline.com/articles/art181703.asp

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Église Saint-Sulpice

Sundial, church of Saint-Sulpice, Paris. The obelisk and brass line on the floor form a sundial. The line is a meridian - a line oriented north-south. The obelisk casts a shadow on it. It dates from the early 17th century and its purpose was to allow accurate solar observations to determine the date of Easter. Mona Evans, "Full Meridian of Glory - book review" http://www.bellaonline.com/articles/art181703.asp

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Observatoire de Paris

Paris Observatory, beginning of the 18th century. (Engraving: C. Wolf) Marly Tower is on the right. Giovanni Domenico Cassini had it moved to the grounds of the observatory in order to mount aerial telescopes and long tubed telescopes. Mona Evans, "Full Meridian of Glory - book review" http://www.bellaonline.com/articles/art181703.asp

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Observatoire de Paris

The Paris Observatory by Nick Bramhall, via Flickr. It's the oldest observatory in the world that is still in operation. Its first four directors were four generations of the Cassini family, starting with Giovanni Domenico. Guillaume Le Gentil lived here before and after his voyage to India for the Venus transit of 1761. ©Mona Evans, "Le Gentil - Heroic Failure" http://www.bellaonline.com/articles/art4615.asp

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Greenwich Meridian

Prime Meridian Marker, Greenwich. This was the meridian established by Astronomer Royal George Airy. It was the one in use when the Greenwich meridian was adopted as the prime meridian of the world by the International Meridian Conference in Washington, DC in 1884. (Photo: Ryan Berlin) ©Mona Evans, “Royal Observatory Greenwich" http://www.bellaonline.com/articles/art31803.asp

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The Herschel Museum of Astronomy

Herschel Museum in Bath, England. Dress worn by Caroline Herschel, in a simple style of white muslin with a blue spot. Its high waist and design of the sleeves date it to the closing years of the 18th century, so Caroline would have been about 50 when she wore it. You can't tell in this photo, but it is quite small for a mature woman. Caroline was always small due to severe childhood illnesses. Mona Evans, “Herschel Museum of Astronomy” http://www.bellaonline.com/articles/art48626.asp

Kew Observatory and Syon Park. The map shows the alignment of the obelisks along the meridian. But it also shows the sites of two 15th century monasteries - Syon Abbey and Sheen Priory. ©Mona Evans, “Kew Observatory” http://www.bellaonline.com/articles/art20247.asp / “Syon House” http://www.bellaonline.com/articles/art49706.asp

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Grove Primary School

Herschel Obelisk as it is today. It's in the grounds of the Grove Primary School in a suburb of Cape Town. (Photo credit: Glen Cozens) Mona Evans, "John Herschel" http://www.bellaonline.com/articles/art183381.asp

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Old Deer Park Gardens

Record of obsevation of the Transit of Venus 1769 from the King's Observatory, Richmond. (credit: King's College London & Armagh Observatory) ©Mona Evans, “Kew Observatory” http://www.bellaonline.com/articles/art20247.asp

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The Herschel Museum of Astronomy

Statue of William & Caroline Herschel in the Garden of Herschel House. The brother and sister team have been described as "the most extraordinary partnership in the history of astronomy." (Photo: Peter Campbell-Burns) Mona Evans, “Herschel Museum of Astronomy” http://www.bellaonline.com/articles/art48626.asp