Astronomical Terms

• Celestial Sphere

  • Imaginary representation of the whole universe

• North Pole

  • direction of Polaris
  • projection of Earth’s rotation axis

• South Pole

  • opposite the N. pole, naturally

• Celestial equator

  • projection of Earth’s equator
  • mid-way between N. and S. poles

• Horizon

  • observer’s limit of view
  • N, S, E, and W points

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