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{"id":5257,"date":"2023-04-05T15:43:43","date_gmt":"2023-04-05T15:43:43","guid":{"rendered":"https:\/\/gonautical.com\/blog\/?p=5257"},"modified":"2023-04-05T15:54:54","modified_gmt":"2023-04-05T15:54:54","slug":"how-to-use-a-sextant-step-by-step","status":"publish","type":"post","link":"https:\/\/gonautical.com\/blog\/how-to-use-a-sextant-step-by-step\/","title":{"rendered":"How to use a sextant step by step"},"content":{"rendered":"\n

Hold the sextant vertically and look at the horizon.<\/li>
Adjust the index arm until the horizon is bisected in the eyepiece.<\/li>
Look at the celestial object you want to measure the altitude of.<\/li>
Adjust the index arm until the celestial object is bisected in the eyepiece.<\/li>
Read the angle on the scale.<\/li>
Here are some tips on how to use a sextant:<\/li><\/ol>\n\n\n
\n
$\"\"$ <\/a>
Admiral Brass Sextant <\/a><\/strong><\/figcaption><\/figure><\/div>\n\n\n
Make sure the sextant is properly aligned before use.<\/li>
Use a steady hand when taking readings.<\/li>
Take readings of both the horizon and the celestial object several times and average the results.<\/li>
Use a chronometer to get the correct time of the observation.<\/li>
Use a nautical almanac to find the position of the celestial object at the time of the observation.<\/li>
Use a chart to plot your position.<\/li><\/ul>\n\n\n\n
Here are some of the common errors when using a sextant:<\/p>\n\n\n\n
Index error: This is the error caused by the index arm not being perfectly aligned with the plane of the mirrors.<\/li>
Collimation error: This is the error caused by the mirrors not being perfectly aligned with each other.<\/li>
Parallax error: This is the error caused by the observer’s eye not being in the same plane as the mirrors.<\/li><\/ul>\n\n\n\n
Here are some of the safety precautions when using a sextant:<\/p>\n\n\n\n
Never look directly at the sun with the sextant.<\/li>
Use the proper eye protection when looking at the sun.<\/li>
Be careful not to drop the sextant.<\/li>
Store the sextant in a safe place when not in use.<\/li><\/ul>\n\n\n\n
<\/p>\n $\"Bookmark$ <\/a>