Sextant

Abstract

A sextant comprises a disc, a movable lens, a fixed lens, a telescope, a swing arm, an installation shell, a support, a first reflector and a second reflector. The installation shell is a hemispherical shell with an upward port, a dial of the disc is downward and vertically arranged in the installation shell, and the installation shell is installed on the support through a rotary mechanism so that the port can be kept to be parallel to the sea level all the time. The first reflector is used for receiving light reflected by the fixed lens and reflecting the light to the second reflector. The telescope is arranged on the edge of the top of the installation shell and can receive the light reflected by the second reflector, a light-sensitive resistor is arranged on the edge of the movable lens, and the light-sensitive resistor is connected with a buzzer. The installation shell and the support are matched so that the observation face of the sextant can be always kept flush with the sea level, and horizontal stability of the sextant is improved. The first reflector, the second reflector, the movable lens and the fixed lens are matched so that the light can be located above the installation shell after being reflected, the light can be conveniently observed through the telescope, and use is convenient. The light-sensitive resistor and the buzzer are arranged so that an operator can quickly and conveniently search for a light source.

Description

technical field [0001] The invention relates to the technical field of a sextant for navigation, in particular to a sextant which has good stability and is convenient for searching light sources. Background technique [0002] The sextant is an optical instrument commonly used in the field of navigation to measure the angle between two distant targets. It is mainly used to measure the angle between the sun or other celestial bodies and the sea level or horizon at a certain moment, so as to quickly know the position of the ship. latitude and longitude. [0003] When a ship sails in the ocean, it often encounters strong winds and waves, and the pitching of the ship will cause large heel and trim angles. Under such sea conditions, it is inconvenient to use a conventional sextant to measure the sun's altitude angle, and it is easy to cause large errors. At the same time, because the existing sextant is generally used directly in the hand, the metal sextant is relatively heavy, a...

AI Technical Summary

Problems solved by technology

Then, it will still affect the stability due to the turbulence of the waves, and it cannot fundamentally solve the problem

[0004] In addition, when the existing sextants are in use, they search for the light source artificially and make it incident on the moving mirror. It is often difficult to grasp the angle when adjusting the position of the moving mirror, resulting in a long time-consuming process.

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