Quick Answer
Celestial navigation accuracy is influenced by the position of the observer, the accuracy of the astronomical tables, and the quality of the navigation instrument, particularly the sextant.
Instrumental Factors
A high-quality sextant is essential for accurate celestial navigation. Look for a sextant with an error of no more than 1 minute of arc. The sextant’s arc should be divided into 120 degrees, and it should be equipped with a micrometer drum with a 1-minute-of-arc graduation. Additionally, the sextant should have a precise index error compensation method, such as a Vernier scale or a digital readout. A good sextant can provide a 1-2 minute-of-arc accuracy.
Astronomical Factors
The accuracy of celestial navigation also depends on the position of the celestial bodies used for navigation. For example, the position of the sun, moon, and planets can be used for navigation, but they require accurate astronomical tables to calculate their positions. The tables should be accurate to within 1 minute of arc for the sun and moon, and 2-3 minutes of arc for the planets. The navigator should also be aware of the effects of atmospheric refraction, which can cause errors of up to 1 minute of arc.
Observer Factors
The observer’s position, altitude, and attitude are critical factors in determining the accuracy of celestial navigation. The observer should be able to maintain a steady and level platform, with an accuracy of 1-2 degrees. The observer’s altitude should be at least 10-15 degrees above the horizon to minimize the effects of atmospheric refraction. The navigator should also be aware of the effects of the observer’s attitude, such as roll, pitch, and yaw, which can cause errors of up to 1-2 minutes of arc.
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