Image:Using sextant swing.gif
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Using_sextant_swing.gif (787 × 393 pixel, file size: 2.1 MB, MIME type: image/gif)
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[edit] Summary
| Description |
Animation of the use of a marine sextant to measure the altitude of the sun |
|---|---|
| Source |
own work |
| Date |
April 2007 |
| Author | |
| Permission |
below |
| Other versions | Image:Using sextant.gif (no captions), Image:Marine sextant.svg |
[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
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