Connaissance des Temps

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The Connaissance des temps (English: Knowledge of Time) is an official astronomical yearly publication in France. Until just after the French Revolution, the title appeared as Connoissance des temps, and for several years afterwards as Connaissance des tems.


Connaissance des temps is the oldest such publication in the world, published without interruption since 1679 (originally named La Connoissance des Temps ou calendrier et éphémérides du lever & coucher du Soleil, de la Lune & des autres planètes), when the astronomer Jean Picard (1620–1682) obtained from the King the right to create the journal. Notable authors were:

Among the other prestigious ephemerides, The Nautical Almanac was only established in 1767 and the Berliner Astronomisches Jahrbuch in 1776.


The volumes of the Connaissance des temps had two parts:

  • a section of ephemerides, containing various tables
  • articles giving a deeper coverage of various topics, often written by famous astronomers


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