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CONVERGENCY MERIDIANS [1 record]
Record 1 - internal organization data 2002-07-16
Record 1, English
Record 1, Subject field(s)
- The Earth (Astronomy)
- Aircraft Piloting and Navigation
- Ship Piloting
- Cartography
Record 1, Main entry term, English
- convergence
1, record 1, English, convergence
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- convergency of the meridians 2, record 1, English, convergency%20of%20the%20meridians
correct
- meridian convergence 3, record 1, English, meridian%20convergence
correct
- convergence of meridians 4, record 1, English, convergence%20of%20meridians
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The phenomenon where the distance between meridians (lines of longitude) decreases as they near the pole. 5, record 1, English, - convergence
Record number: 1, Textual support number: 1 CONT
Meridian convergency error is caused ... by the fact that lines of longitude (meridians) converge as they approach the poles. If the spin axis of a D.G. [directional gyro] is aligned with a meridian at one point on the earth's surface and then flown to a different location in any direction other than due north or south, it will remain aligned with the original meridian because of it's tendency to remain in one orientation in space. Due to the convergency of the meridians, the gyro will not be aligned with the destination meridian. The angle between the D.G. spin axis and the destination meridian is the convergency error. 6, record 1, English, - convergence
Record 1, French
Record 1, Domaine(s)
- Terre (Astronomie)
- Pilotage et navigation aérienne
- Pilotage des navires
- Cartographie
Record 1, Main entry term, French
- convergence des méridiens
1, record 1, French, convergence%20des%20m%C3%A9ridiens
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
[...] l'erreur de convergence des méridiens est produite par le fait que les lignes de longitude (méridiens) convergent en s'approchant des pôles. En supposant que l'axe de rotation d'un gyroscope directionnel (D.G.) soit aligné sur un méridien en un point donné de la terre, et puis qu'on le transporte en un endroit différent autre que vers le nord ou le sud, l'axe de ce dernier restera aligné sur le méridien d'origine, vue sa propriété de demeurer fixe dans l'espace. Donc on peut voir qu'à cause de la convergence des méridiens, un gyroscope ne peut demeurer aligné sur le méridien de destination. L'angle formé entre l'axe de rotation du gyroscope (D.G.) et le méridien de destination est appelé «erreur de convergence des méridiens». 2, record 1, French, - convergence%20des%20m%C3%A9ridiens
Record number: 1, Textual support number: 2 CONT
On utilise une représentation plane de la terre ou projection afin : de représenter sur une surface plane une partie d'un modèle ellipsoïdal de la surface de la terre. [...] Dans la plupart des projections, le Nord de la projection n'indique pas la direction du pôle Nord géographique. On introduit alors la notion de convergence des méridiens définie comme suit : la convergence des méridiens en un point est le gisement de l'image (dans la projection) du méridien qui passe par ce point. 3, record 1, French, - convergence%20des%20m%C3%A9ridiens
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Tierra (Astronomía)
- Pilotaje y navegación aérea
- Pilotaje de buques
- Cartografía
Record 1, Main entry term, Spanish
- convergencia de meridianos
1, record 1, Spanish, convergencia%20de%20meridianos
feminine noun
Record 1, Abbreviations, Spanish
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
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