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, 19s)

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Picture of the day

This image was selected as a picture of the day for 16 June 2007(2007-06-16). It was captioned as follows:

English: Animation of the use of a marine sextant to measure the altitude of the sun.

[edit] Summary

Description
English: Animation of the use of a marine sextant to measure the altitude of the sun
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) Feinabstimmmung (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

April 2007(2007-04)

Source

Own work

Author

Joaquim Alves Gaspar

Permission
(Reusing this file)
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w:en:Creative Commons
attribution share alike
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Other versions
Corel logo.svg This vector graphics image was created with CorelDRAW.

[edit] 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').
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Quality image

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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)Alvesgaspar
18:45, 9 April 2007Thumbnail for version as of 18:45, 9 April 2007787 × 393 (2.1 MB)Alvesgaspar
18:32, 9 April 2007Thumbnail for version as of 18:32, 9 April 2007787 × 393 (2.1 MB)Alvesgaspar
23:02, 7 April 2007Thumbnail for version as of 23:02, 7 April 2007787 × 393 (2.1 MB)Alvesgaspar
17:27, 7 April 2007Thumbnail for version as of 17:27, 7 April 2007787 × 393 (2.1 MB)Alvesgaspar
17:08, 7 April 2007Thumbnail for version as of 17:08, 7 April 2007787 × 393 (2.1 MB)Alvesgaspar
09:12, 5 April 2007Thumbnail for version as of 09:12, 5 April 2007787 × 393 (2.05 MB)Alvesgaspar
20:28, 4 April 2007Thumbnail for version as of 20:28, 4 April 2007787 × 393 (2.08 MB)Alvesgaspar
22:32, 3 April 2007Thumbnail for version as of 22:32, 3 April 2007787 × 393 (2.11 MB)Alvesgaspar ({{Information |Description=Animation of the use of a marine sextant to measure the altitude of the sun |Source=own work |Date=April 2007 |Author=Joaquim Alves Gaspar |Permission=below |other_versions=Image:Using_sextant_swing.gif)

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