Megaparsec
A megaparsec (Mpc) is a unit of distance used in astronomy to measure vast stretches across the universe. One megaparsec equals one million parsecs, or about 3.26 million light-years (1 Mpc ≈ 3.086 × 10¹⁹ kilometers). This unit is commonly used when discussing the distances between galaxies, galaxy clusters, or large-scale structures of the universe. Because the universe is so massive, astronomers need units like megaparsecs to express distances that are too large for even light-years to handle efficiently. The megaparsec is essential in cosmology and is often used when describing the scale of the observable universe.
Link (US Survey)
The US survey link is a unit of length used in the United States for land surveying, defined as exactly 7.92 US survey inches. Since one US survey inch is slightly longer than the international inch (due to the US survey foot), the US survey link is approximately 0.201168 meters.
It is part of the US survey system, derived from Gunter’s chain, which is divided into 100 links per chain (66 US survey feet). Links are used to measure small distances in surveying and land measurement.
Key facts:
1 US survey link = 7.92 US survey inches
1 US survey link ≈ 0.201168 meters
100 links = 1 US survey chain (66 US survey feet)
25 links = 1 US survey rod (16.5 US survey feet)
Though the US survey units are being phased out, the US survey link still appears in historical land records and legal surveying documents.
No conversions available for length.