celestial navigation

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Sailors use celestial navigation to find their way across the open ocean.

Definition

Noun:
- Navigating according to the positions of the stars: The method of determining a ship's or aircraft's position by observing celestial bodies (primarily the sun, moon, planets, and stars) and using their positions relative to a known time.

Usage

Celestial navigation is a traditional skill used by sailors and aviators. It involves using a sextant to measure the angle between a celestial body and the horizon, then performing calculations to determine latitude and longitude.
This term is used in contexts related to maritime history, traditional sailing, aviation, and survival skills. It is often contrasted with modern electronic navigation methods like GPS.

Examples

Before the invention of GPS, celestial navigation was essential for transoceanic voyages.
The sailor practiced celestial navigation every clear night to maintain his skills.
Learning celestial navigation requires understanding astronomical tables and spherical trigonometry.

Advanced Usage

"To shoot the sun": A traditional phrase meaning to take a sextant sighting of the sun's altitude for navigation.
- At noon, the captain went on deck to shoot the sun for a latitude fix.
"To take a sight": The act of measuring the altitude of a celestial body.
- The navigator took a sight of Polaris to check their northern progress.

Variants and Related Words

Astronavigation (n): A synonym for celestial navigation.
Celestial (adj): Pertaining to the sky or visible heavens.
Navigation (n): The process or activity of accurately ascertaining one's position and planning and following a route.

Synonyms

Related Phrases

Dead reckoning: A method of calculating one's current position by using a previously determined position, and advancing that position based upon known or estimated speeds over elapsed time and course. Often used in conjunction with celestial navigation.
Piloting: Navigation by using visible landmarks, buoys, or depth soundings, typically used in coastal waters. This contrasts with the open-ocean use of celestial navigation.

Related Idioms

"By the stars": Literally, to navigate using the stars; figuratively, to proceed based on intuition or a general sense of direction.
- With his compass broken, he had to sail by the stars. (Literal)
- We don't have a detailed plan; we're just running this project by the stars. (Figurative)

Sailors use celestial navigation to find their way across the open ocean.

Noun

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