nautical sextant

A nautical sextant is a handheld optical instrument used to measure the height of a celestial body or the angle between two targets. It can help a ship determine its own or target's direction, as well as its relative position to other ships or objects.

The principle of the navigation sextant is to use two plane mirrors to reflect the light of the celestial body into the telescope, so that the image of the celestial body is tangent to the water antenna or other celestial body, so as to read the scale on the graduation arc and obtain the altitude angle of the celestial body or The angle between the two targets.

The main uses of navigation sextant are:

Measure the height of celestial objects. The nautical sextant can be used to measure the angle between the sun or other celestial bodies and the sea level at a certain moment, so as to calculate the local latitude based on the astronomical calendar, or to measure the height of Polaris to directly obtain the local latitude.

Measure the angle between two targets. A nautical sextant can be used to measure the angle between two distant targets to determine the relative position of the two targets, or to measure the angle between two celestial bodies to determine the local time.

Indicate the direction. A navigation sextant can be used to indicate the direction of oneself or a target to choose the best route, or it can be used in conjunction with a compass and other instruments to improve navigation accuracy.

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