Editing Paris Observatory (section)

===Accomplishments===
In 1671 Saturn's moon [[Iapetus (moon)|Iapetus]] was discovered from the observatory, followed by [[Rhea (moon)|Rhea]] in 1672.<ref name=":4">{{Cite book|url=https://books.google.com/books?id=-ePHSCLOMvwC&q=paris+observatory+discoveries&pg=PA66|title=Cosmic Discoveries: The Wonders of Astronomy|last=Levy|first=David H.|date=2010-09-09|publisher=Prometheus Books|isbn=9781615925667}}</ref> The moons [[Dione (moon)|Dione]] and [[Tethys (moon)|Tethys]] were also discovered from the observatory in 1684.<ref name=":4" /> In 1676 the staff concluded that light itself was travelling at a finite speed.<ref>{{Cite journal|last=Abbott|first=Alison|date=January 2009|title=Hidden treasures: the Paris Observatory|journal=Nature|volume=457|issue=7225|pages=33|doi=10.1038/457033a|issn=1476-4687|doi-access=free}}</ref>

[[Image:Obs-Paris-meridienne.jpg|thumb|upright=1.1|The Meridian Room (or Cassini Room) at the Paris Observatory. The [[Paris Meridian]] is traced on the floor.]]
The world's first national almanac, the ''[[Connaissance des Temps|Connaissance des temps]],'' was published by the Observatory in 1679, using eclipses in [[Jupiter]]'s satellites to aid sea-farers in establishing [[longitude]]. In 1863, the observatory published the first modern [[weather map]]s. In 1882, a {{convert|33|cm|abbr=on}} [[astrograph]]ic [[lens (optics)|lens]] was constructed, an instrument that catalysed what proved to be the over-ambitious international ''[[Carte du Ciel]]'' project.{{Citation needed|date=August 2007}}

In November 1913, the observatory used the [[Eiffel Tower]] as an [[Antenna (radio)|antenna]], exchanged sustained radio signals with the [[United States Naval Observatory]] in [[Washington, D.C.]] to determine the exact difference of longitude between the two institutions.<ref>"Paris Time By Wireless," ''New York Times,'' Nov 22, 1913, pg 1.</ref>