secpar
Học thuậtThân thiện
Definition
Noun: - A unit of astronomical distance. It is defined as the distance from Earth at which an object would have a stellar parallax angle of exactly one arcsecond. This unit is equivalent to approximately 3.262 light-years.
Usage
The term 'secpar' is a technical unit used in astronomy to express vast interstellar and intergalactic distances based on the principle of parallax measurement. - The star is located approximately 150 secpars from our solar system. - Astronomers often use the secpar for measurements within our galaxy.
Advanced Usage
- Parallax Second: 'Secpar' is synonymous with the more common term 'parsec', which is a contraction of "parallax second". The parsec is the standard unit in professional astronomy.
- The nearest star to the Sun, Proxima Centauri, is about 1.3 parsecs (secpars) away.
Variants and Related Words
- Parsec (n): The standard and more frequently used term for the same unit of distance. One parsec is exactly equal to one secpar.
- Kiloparsec (n): A unit equal to one thousand parsecs/secpars, used for larger galactic distances.
- Megaparsec (n): A unit equal to one million parsecs/secpars, used for extragalactic and cosmological distances.
Synonyms
- Parsec: The direct and primary synonym.
- Astronomical Unit (AU): A much smaller related unit of distance; one parsec is approximately 206,265 AU.
Noun
- a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years