THE BUREAU DES LONGITUDES

The Bureau des longitudes is an academy responsible of the definition of the French National Ephemerides. The making of these ephemerides is entrusted to the Institut de mecanique celeste et de calcul des ephemerides, IMCCE, which has the form of an institute linked to Paris Observatory.

MISSIONS

Created by the law of the messidor 7, year 3 by the Convention Nationale, the Bureau des longitudes received various missions which changed during years and are currently described by the decree of January 30, 1970. The Bureau des longitude has the responsibility of the missions which it entrusts to the Institut de mecanique celeste et de calcul des éphémérides (IMCCE).

MEMBERS

The Bureau des longitudes includes :

• 13 regular members
• members in extraordinary servicees
• 32 corresponding members

The Bureau of this academy and the list of the members are available on the Bureau des longitudes website.

ACTIVITIES

The Bureau des longitudes meet once per month. It publishes the cahiers des sciences de l'univers and organizes scientific public open talks.

 The cahiers des sciences de l´univers

Since 1991, the Bureau des longitudes publishes "les cahiers des sciences de l'univers" which includes the following titles :

• Les profondeurs de la Terre par J.-P. Poirier (1991)
• Stratosphère et couche d´ozone par G. Mégie (1992)
• Chronique de l´espace-temps, du vide quantique à l´expansion cosmique par A. Mazure, G. Mathez, Y. Mellier (1994)
• Les fondements de la mesure du temps par C. Audoin, B. Guinot.

 The encyclopaedia of the Bureau des longitudes

The Bureau des longitudes has published during long years a directory with an encyclopaedic part; since 1977, the directory contained only annual astronomical data and the encyclopaedic part was published in the form of an encyclopeadia du Bureau des longitudes which includes the following titles :

• La Terre, les eaux, l´atmosphère (1986)
• Les étoiles. Le système solaire (1986, second publishing)
• La Physique (1981)
• La galaxie. L´univers extragalactique (1988, second publishing)

 Scientific talks

Conferences are proposed every first Tuesday of the month. They take place at the 23 quai Conti, Paris 6th, Hugo room and are public opened.

 Meetings of the Bureau des longitudes

The academy of the Bureau meets once per month. Informations about the meetings are only available for the members of the Bureau des longitudes. Only past meetings reports are accessible to the historians.

 History of the Bureau des longitudes

Here is the text founder of the Bureau des longitudes (law of the messidor 7, year 3 by the Convention Nationale) and here are informations about the history of the Bureau des longitudes..

 Laws and decrees of The Bureau des longitudes

Laws and decrees of The Bureau des longitudes remains in restricted access.

 The Bureau des longitudes website

Click on the Web site of the Bureau des longitudes to obtain the public open conferences, titles, dates and the organized events.

 The Institut de mécanique céleste et de calcul des éphémérides

By decree of June 2, 1998, the Bureau des longitudes missions' such as the directories publication, astronomical tables, astronomical data useful to the life of the nation are entrusted to the Institut de mechanique céleste et de calcul des éphémérides which succeeded its calculations service. All informations, missions and research activities are available on this website

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