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Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 OBS

The Dominion Observatory was founded for very pragmatic reasons. The objective was to have a longitude reference(with associated time signal) for surveying in Canada :"To open up the West". Surveyors in the field would compare the time signal of the Dominion Observatory with their local time determined by astronomical observations-the difference corresponding to longitude difference between Canada's prime meridian(Dominion Observatory) and their location. Construction of the building began in July 1902 was completed in 1905.  2, fiche 1, Anglais, - Dominion%20Observatory

Record number: 1, Textual support number: 2 OBS

The Dominion Observatory was an astronomical observatory in Ottawa, Canada that operated from 1905 to 1970. The Observatory was also an institution within the Canadian Federal Government. The observatory grew out of the Department of the Interior’s need for the precise coordinates and timekeeping that at that time could only come from an observatory. For several years they had used a small observatory on the Ottawa River for this purpose. In 1902 it was decided that Canada needed a larger national observatory similar to the Royal Greenwich Observatory in Britain. The new building was thus erected near Dow’s Lake on the Agriculture Department’s Central Experimental Farm land. This building was completed in 1905. Its main instrument was a 15 inch refracting telescope, the largest refracting telescope ever installed in Canada. While the building and institution were primarily dedicated to astronomical timekeeping in support of surveying, a number of other activities took place here. The Dominion Observatory was Canada’s leading institution in Geophysics for many decades, which included the operation of Canada’s national seismometer network. The facility did important work but with this bridgehead into the world of astronomy and the growth of the field of astrophysics Canadian astronomers quickly demanded a facility designed for the new scientific age.  3, fiche 1, Anglais, - Dominion%20Observatory

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 OBS

L'Observatoire fédéral fut fondé pour des raisons très pragmatiques. L'objectif était d'obtenir une référence de longitude (comprenant le signal horaire associé) pour l'arpentage au Canada : «Pour coloniser l'Ouest». Les arpenteurs sur le terrain devaient comparer le signal horaire de l'Observatoire fédéral avec l'heure locale où ils se trouvaient, déterminée par des observations astronomiques, soit la différence correspondant à l'écart de longitude entre le méridien origine au Canada (l'Observatoire fédéral) et leur emplacement. La construction de l'édifice débuta en juillet 1902 et fut achevée en 1905.  1, fiche 1, Français, - Observatoire%20f%C3%A9d%C3%A9ral

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

The following data(times) were used in calculating the difference in longitude between Hildesheim and Paris with data obtained during the lunar eclipse on 27. September 1996.  1, fiche 2, Anglais, - difference%20in%20longitude

Fiche 2,  Justifications,  Français

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

The ratio of the grid convergence angle to the longitude difference. In the Lambert Conical Orthomorphic projection this ratio is constant for all charts based on the same two standard parallels.  1, fiche 3, Anglais, - grid%20convergence%20factor

Record number: 3, Textual support number: 1 OBS

grid convergence factor: term and definition standardized by NATO.  2, fiche 3, Anglais, - grid%20convergence%20factor

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 DEF

Rapport entre l'angle de convergence des méridiens et leur différence de longitude. Dans la projection conique conforme de Lambert, ce rapport est constant pour toutes les cartes ayant les mêmes parallèles de référence.  2, fiche 3, Français, - facteur%20de%20convergence%20du%20quadrillage

Record number: 3, Textual support number: 1 OBS

facteur de convergence de la grille : terme et définition normalisés par l'OTAN.  3, fiche 3, Français, - facteur%20de%20convergence%20du%20quadrillage

Record number: 3, Textual support number: 2 OBS

facteur de convergence du quadrillage : terme uniformisé par le Groupe de travail de terminologie de l'Artillerie royale canadienne et par le Comité de terminologie française du Conseil de doctrine et de tactique de l'Armée de terre.  3, fiche 3, Français, - facteur%20de%20convergence%20du%20quadrillage

Fiche 3,  Justifications,  Espagnol

Record number: 3, Textual support number: 1 DEF

Relación entre el ángulo de convergencia del cuadriculado y su diferencia de longitud. En la proyección cónica ortomórfica Lambert esta relación es constante para todos los mapas que tienen los mismos paralelos de referencia.  1, fiche 3, Espagnol, - factor%20de%20convergencia%20de%20la%20cuadr%C3%ADcula