Image:Using sextant swing.gif

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[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.
Português: Animação demonstrando o uso do sextante náutico na medição da altura do Sol acima do horizonte
Source

own work
Date

April 2007
Author

Joaquim Alves Gaspar
Permission
(Reusing this image)

below
Other versions Image:Using sextant.gif (no captions), Image:Marine sextant.svg

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 This is a featured picture on Wikimedia Commons: it is considered one of our finest images.
This is a featured picture on English Wikipedia and is considered one of the finest images.
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Picture of the day This image was selected as a picture of the day for June 16, 2007. It was captioned as followed:
English: Animation of the use of a marine sextant to measure the altitude of the sun.
Беларуская: Схема карыстання марскім секстантам для вымярэння вугла падняцця Сонца над кругавідам.
Česky: Animace měření zeměpisné polohy lodi na moří pomocí sextantu
Deutsch: Animation zum Gebrauch eines Sextanten um den Winkel der Sonne über dem Horizont zu messen.
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 la altura del sol.
Français : Animation montrant l'usage d'un sextant de marine pour mesurer la hauteur du soleil.
Magyar: Animáció a Nap horizont feletti magasságának méréséről szextánssal.
Italiano: Esempio animato dell'uso di un sestante per misurare l'altitudine del sole.
日本語: 海上で六分儀を使用して太陽の高度を測定する手順のアニメーション
Nederlands: Engelstalige animatie van het gebruik van een sextant voor het meten van de hoogte van de zon
Polski: Animacja zasady działania i korzystania z sekstantu
Português: Animação sobre o uso do sextante náutico para medir a altura do Sol.
Română: Animaţie care ilustrează utilizarea unui sextant pentru măsurarea altitudinii soarelui.
Русский: Наглядный пример использования морского секстанта для измерения угла возвышения Солнца над горизонтом.
Slovenčina: Animácia merania zemepisnej polohy lodi na mori pomocou sextantu.
Svenska: Animering av hur en sextant används för att mäta solens höjd över horisonten.
‪中文(简体)‬: 用六分仪测量太阳高度的动画。
‪中文(繁體)‬: 運用航海六分儀來量度太陽高度的動畫

VI seal This is a valued image on Wikimedia Commons. The 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 at Commons:Valued image candidates/Using sextant swing.gif.


[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').

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons License
Creative Commons Attribution iconCreative Commons Share Alike icon		 This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one. Official license

File history

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Date/TimeDimensionsUserComment
current22:00, 2 November 2007787×393 (2.1 MB)Alvesgaspar
18:45, 9 April 2007787×393 (2.1 MB)Alvesgaspar
18:32, 9 April 2007787×393 (2.1 MB)Alvesgaspar
23:02, 7 April 2007787×393 (2.1 MB)Alvesgaspar
17:27, 7 April 2007787×393 (2.1 MB)Alvesgaspar
17:08, 7 April 2007787×393 (2.1 MB)Alvesgaspar
09:12, 5 April 2007787×393 (2.05 MB)Alvesgaspar
20:28, 4 April 2007787×393 (2.08 MB)Alvesgaspar
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)