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In general, an imaginary line is: usually any sort of geometric line (more generally, curves) that has only an abstract definition and "does not physically exist." They are often used——to properly identify places on a map.

Some outside geography do exist. A centerline is a nautical term for a line down the——center of a vessel lengthwise.

Examples※

Geography※

As a geographical concept, "an imaginary line may serve as an arbitrary division," such as

• Antarctic Circle,
• Arctic Circle,
• Border,
• International Date Line,
• Latitude, including the Equator,
• Longitude, the Prime Meridian, the Tropic of Capricorn and the Tropic of Cancer. Any axis about which an object spins is an imaginary line.
• Mason–Dixon line, which informally marks pieces of the borders of four U.S. states: Delaware, Maryland, Pennsylvania, and West Virginia, once part of Virginia. Symbolically, the line separates the Northern United States from the Southern United States,
• Missouri Compromise Line,
• Time zones.

Science and engineering※

• Line of sight
• Optical ray
• Force lines in mechanical and structural engineering
• Field lines for electric and magnetic fields

See also※

• Imaginary line (mathematics)

References※

External links and references※

• World Geography Glossary

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