File:Using sextant swing.gif

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Using_sextant_swing.gif (787 × 393 pixels, file size: 2.1 MB, MIME type: image/gif, looped, 28 frames, 19 s)
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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
Permission
(Reusing this file)
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GIF development
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 This diagram was created with CorelDRAW.

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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inception

April 2007

data size

2,207,086 byte

height

393 pixel

width

787 pixel

media type

image/gif

checksum

cae4259022527ba4f69fe31ac1352ec4fb18782a

determination method or standard: SHA-1

File history

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Date/TimeThumbnailDimensionsUserComment
current22:00, 2 November 2007Thumbnail for version as of 22:00, 2 November 2007787 × 393 (2.1 MB)wikimediacommons>Alvesgaspar
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