anomalistic year

Thân thiện

An anomalistic year is the time it takes Earth to orbit from perihelion to perihelion.

Definition

1. Noun:
   • The time interval for the Earth to complete one revolution around the Sun, measured from one perihelion (the point of closest approach to the Sun) to the next perihelion. This period is approximately 365 days, 6 hours, 13 minutes, and 53.1 seconds.

Usage

• The term is used in astronomy and celestial mechanics to describe a specific orbital cycle of the Earth.
• It is distinguished from other types of years (e.g., the tropical year) by its specific reference point (perihelion).

Examples

• Noun:
  • The anomalistic year is about 25 minutes longer than the tropical year.
  • Astronomers calculate the precise length of the anomalistic year to understand variations in the Earth's orbit.

Advanced Usage

• "The length of the anomalistic year": A common phrase referring to its specific duration.
  • The length of the anomalistic year is slowly changing over millennia.

Variants and Related Words

• Anomalistic (adj): Pertaining to an anomaly or, in astronomy, to the angular distance of a planet or satellite from its last perihelion or perigee.
  • Anomalistic period refers to the time between successive perihelion passages for any orbiting body.
• Perihelion (n): The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

Synonyms

• Perihelion-to-perihelion year: A descriptive synonym that explicitly states the measurement points.

Notes on Different Meanings

• This is a technical, single-meaning term used specifically in astronomy. It does not have the general, common-year meanings associated with the standalone word "year."

Học thuật

Noun

1. time of the earth's revolution from perihelion to perihelion again; 365 days and 6 hr and 13 min and 53.1 sec