File:Using sextant swing.gif

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This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope: The use of a marine sextant at sea. You can see its nomination here.

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Summary

Description
English: Animation of the use of a marine sextant to measure the altitude of the sun
Español: Animación del uso de un sextante para medir el ángulo de altitud del sol.
Français : Animation montrant l'usage d'un sextant de marine pour mesurer la hauteur du soleil. Légende: (1) pointer le sextant sur l'horizon, (2) libérer le frein de la barre d'index, (3) Mener le soleil à l'horizon, (4) freiner la barre d'index, ajuster finement la lecture à l'aide de la molette. (5) basculer l'appareil pour vérifier l'alignement, (6) lire l'angle mesuré.
Deutsch: Animation, die den Gebrauch eines Sextanten zur Messung der Sonnenhöhe zeigt: (1) Ausrichten des Sextanten zum Horizont, (2) Schwenken des Indexspiegels, (3) Sonne und Horizont egalisieren, (4) Feinabstimmung (5) Schwenken zur Verifizierung der Einstellung, (6) Ablesen der Messung.
Português: Animação demonstrando o uso do sextante náutico na medição da altura do Sol acima do horizonte
Date
Source Own work
Author Joaquim Alves Gaspar
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(Reusing this file)
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Explanation of frames (also see Image:Marine sextant.svg)

  1. - Point the sextant to the horizon in the direction of the Sun. The horizon is visible at left, through the glass, and also at right, reflected by the two mirrors. The index arm is at the zero position.
  2. - Press the clamp to release the index bar.
  3. - Rotate the index bar to bring the reflected image of the Sun to the horizon.
  4. - The lower limb of the Sun is now almost touching the horizon. Release the clamp and adjust the sun's position with the micrometer.
  5. - Swing the sextant to verify the sun's position (adjust if necessary).
  6. - Read the altitude at the arc scale and micrometer drum (about 40º 15').

Quality image

This image has been assessed using the Quality image guidelines and is considered a Quality image.

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