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Meridian

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Intro to Astronomy

Definition

A meridian is an imaginary line that runs from the North Pole to the South Pole and passes through a specific point on Earth's surface. It is used in astronomy to determine the position of celestial bodies.

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5 Must Know Facts For Your Next Test

  1. The Prime Meridian, located at 0° longitude, is the starting point for measuring longitude.
  2. Meridians are essential in celestial navigation and timekeeping.
  3. The local meridian of a location is used to determine when a celestial object will be at its highest point in the sky.
  4. Every place on Earth has its own local meridian.
  5. When a celestial object crosses an observer's local meridian, it reaches its highest altitude above the horizon, known as culmination.

Review Questions

  • What is the significance of the Prime Meridian?
  • How do meridians assist in determining the position of celestial bodies?
  • What happens when a celestial object crosses an observer's local meridian?

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