Definition

1. Adjective:

   • Of or existing at or near the geographic equator: Describing something located in or characteristic of the region surrounding the Earth's equator.
   • Of or relating to conditions at the geographical equator: Pertaining to the typical climate, weather, or environmental features found at the equator.
   • Of or relating to or at an equator: In a broader sense, relating to the concept of an equator, such as the celestial equator or an equatorial diameter.

2. Noun:

   • A telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it: A specific type of astronomical telescope mount designed to track celestial objects by aligning with the Earth's rotation.

Examples of Usage

• Adjective:

  • The equatorial climate is known for being hot and humid throughout the year.
  • Scientists study equatorial forests due to their incredible biodiversity.
  • The planet's equatorial diameter is larger than its polar diameter.

• Noun:

  • The observatory installed a new equatorial to improve its tracking of stars.
  • For astrophotography, an equatorial mount is essential to compensate for the Earth's rotation.

Advanced Usage

• In Astronomy: The term is often used to describe coordinates (equatorial coordinate system) or telescope mounts.

  • The object's position is given in equatorial coordinates of right ascension and declination.

• In Geography and Climate Science: Used to classify climate zones and biomes.

  • Equatorial regions experience minimal variation in daylight hours over the year.

Variants and Related Words

• Equator (n): The imaginary great circle around the Earth, equidistant from the poles.
• Equatorially (adv): In an equatorial manner or direction.
• Nonequatorial (adj): Not located at or pertaining to the equator.

Synonyms

• Tropical (adj): Relating to the tropics, the region roughly bounded by the Tropics of Cancer and Capricorn. (Note: "Tropical" is a broader zone that includes but is not limited to the equatorial region.)
• Central (adj): At or near the center. (Can be used in a geographical context, but is less specific.)

Related Phrases

• Equatorial bulge: The slight bulge of a planet around its equator due to rotation.
  • Earth's equatorial bulge makes its shape an oblate spheroid.
• Equatorial plane: The plane that contains the equator of a celestial body.
  • The satellites orbit in the Earth's equatorial plane.

Adjective

1. of or existing at or near the geographic equator
   • equatorial Africa
2. of or relating to conditions at the geographical equator
   • equatorial heat
3. of or relating to or at an equator
   • equatorial diameter

Noun

1. a telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it