How to use a sextant step by step

1. Hold the sextant vertically and look at the horizon.
2. Adjust the index arm until the horizon is bisected in the eyepiece.
3. Look at the celestial object you want to measure the altitude of.
4. Adjust the index arm until the celestial object is bisected in the eyepiece.
5. Read the angle on the scale.
6. Here are some tips on how to use a sextant:

• Make sure the sextant is properly aligned before use.
• Use a steady hand when taking readings.
• Take readings of both the horizon and the celestial object several times and average the results.
• Use a chronometer to get the correct time of the observation.
• Use a nautical almanac to find the position of the celestial object at the time of the observation.
• Use a chart to plot your position.

Here are some of the common errors when using a sextant:

• Index error: This is the error caused by the index arm not being perfectly aligned with the plane of the mirrors.
• Collimation error: This is the error caused by the mirrors not being perfectly aligned with each other.
• Parallax error: This is the error caused by the observer’s eye not being in the same plane as the mirrors.

Here are some of the safety precautions when using a sextant:

• Never look directly at the sun with the sextant.
• Use the proper eye protection when looking at the sun.
• Be careful not to drop the sextant.
• Store the sextant in a safe place when not in use.