south celestial pole

Thân thiện

The astronomer points her telescope toward the south celestial pole.

Definition

1. Noun:
   • The point in the sky directly above Earth's South Pole: The south celestial pole is the imaginary point in the southern sky where Earth's axis of rotation, if extended infinitely southward, intersects the celestial sphere. It is the southern counterpart to the north celestial pole.

Usage

• The south celestial pole is a fixed reference point in the night sky for observers in the Southern Hemisphere.
• Unlike the north celestial pole, which is marked by Polaris, there is no bright star at the south celestial pole.
• To locate the south celestial pole, one can use the constellation Crux (the Southern Cross) and the pointer stars in Centaurus.

Examples

• Noun:
  • The south celestial pole is the point around which the stars of the southern sky appear to rotate.
  • Navigators in the Southern Hemisphere can use the south celestial pole to determine their latitude.

Advanced Usage

• "Circumpolar stars": Stars that never set below the horizon from a given latitude because they are close to a celestial pole. For an observer at the South Pole, all stars are circumpolar and circle the south celestial pole.
  • From Antarctica, the entire visible sky appears to wheel around the south celestial pole.

Variants and Related Words

• Celestial pole (n): Either of the two points (north or south) where the Earth's axis of rotation meets the celestial sphere.
• North celestial pole (n): The celestial pole above the Northern Hemisphere, closely aligned with the star Polaris.
• Celestial sphere (n): An imaginary sphere of arbitrarily large radius, concentric with Earth, on which all celestial objects appear to be projected.

Synonyms

• Southern pole of the heavens: A less common, descriptive synonym for the south celestial pole.

Related Concepts (Not Phrasal Verbs or Idioms)

• Polar alignment: The process of aligning a telescope's mount with the celestial pole (north or south) to track stars accurately.
• Right ascension: A celestial coordinate measured eastward from the vernal equinox; lines of right ascension converge at the celestial poles.
• Declination: A celestial coordinate measured in degrees north or south of the celestial equator; the south celestial pole has a declination of -90 degrees.

Học thuật

Noun

1. the celestial pole above the southern hemisphere