A sextant is a navigation instrument used by seafarers to measure the angle between a celestial body (sun, moon, star) and the horizon.

The sextant is used to determine a ship’s position at sea, specifically latitude and longitude, by celestial navigation—especially when GPS is unavailable. Old-school, but still gold 🧭

Parts of a Sextant
• Frame – The main body that supports all parts of the sextant.
• Telescope – Used to view the horizon and the celestial body clearly.
• Index Mirror – Reflects the image of the celestial body.
• Horizon Mirror – Allows the observer to see both the horizon and reflected image at the same time.
• Index Arm – Movable arm used to adjust the angle being measured.
• Graduated Arc – Curved scale where angles are read in degrees.
• Drum (Micrometer Drum) – Fine adjustment for precise angle readings.
• Locking Device – Secures the index arm in place after adjustment.
• Glass Filters – Protect the eyes when observing bright objects like the sun.

A sextant is a precision navigational tool that helps mariners calculate their position at sea by measuring angles between celestial bodies and the horizon.