Understanding chains to parsecs Conversion
The chain is an imperial surveying unit of 66 feet, or 20.1168 meters. The parsec is an astronomical distance of about 3.086 × 10¹⁶ meters, defined by stellar parallax and used to express distances to stars and galaxies. Converting chains to parsecs contrasts a terrestrial land unit with a cosmic one and is used mainly to teach scale.
Conversion Formula
To convert chains to parsecs, multiply by this factor:
Step-by-Step Example
Convert 25 chains to parsecs.
How to Convert chains to parsecs
This maps a small survey length onto the astronomical parsec using a very small factor.
- Take the chain value: Begin with the length in chains.
- Multiply by 6.519411 × 10⁻¹⁶: Apply parsecs per chain.
- Use scientific notation: Present the tiny result in exponential form.
- Worked result: 25 chains × 6.519411 × 10⁻¹⁶ = 1.629853 × 10⁻¹⁴ parsec.
chains to parsecs conversion table
| chains (ch) | parsecs (pc) |
|---|---|
| 0 | 0 |
| 1 | 6.519411e-16 |
| 2 | 1.303882e-15 |
| 3 | 1.955823e-15 |
| 4 | 2.607764e-15 |
| 5 | 3.259705e-15 |
| 6 | 3.911647e-15 |
| 7 | 4.563588e-15 |
| 8 | 5.215529e-15 |
| 9 | 5.86747e-15 |
| 10 | 6.519411e-15 |
| 15 | 9.779116e-15 |
| 20 | 1.303882e-14 |
| 25 | 1.629853e-14 |
| 30 | 1.955823e-14 |
| 40 | 2.607764e-14 |
| 50 | 3.259705e-14 |
| 60 | 3.911647e-14 |
| 70 | 4.563588e-14 |
| 80 | 5.215529e-14 |
| 90 | 5.86747e-14 |
| 100 | 6.519411e-14 |
| 150 | 9.779116e-14 |
| 200 | 1.303882e-13 |
| 250 | 1.629853e-13 |
| 300 | 1.955823e-13 |
| 400 | 2.607764e-13 |
| 500 | 3.259705e-13 |
| 600 | 3.911647e-13 |
| 700 | 4.563588e-13 |
| 800 | 5.215529e-13 |
| 900 | 5.86747e-13 |
| 1000 | 6.519411e-13 |
| 2000 | 1.303882e-12 |
| 3000 | 1.955823e-12 |
| 4000 | 2.607764e-12 |
| 5000 | 3.259705e-12 |
| 10000 | 6.519411e-12 |
| 25000 | 1.629853e-11 |
| 50000 | 3.259705e-11 |
| 100000 | 6.519411e-11 |
| 250000 | 1.629853e-10 |
| 500000 | 3.259705e-10 |
| 1000000 | 6.519411e-10 |
What is the chain?
The chain (ch) is a unit of length in the imperial and US customary systems, equal to 66 feet, traditionally used in surveying and land measurement.
Definition
One chain equals 66 feet, or 22 yards, or 4 rods.
There are 80 chains in a mile and 10 square chains in an acre. This value uses the international foot; the US survey chain is larger by a factor of 1200/1199, giving about 20.11684 m.
Origin and History
The chain is named for Gunter's chain, a physical measuring device introduced by the English clergyman and mathematician Edmund Gunter around 1620. It consisted of 100 iron links totalling 66 feet, elegantly bridging the traditional (base-4/16.5) and decimal systems: distances could be recorded in decimal links yet still yield whole numbers of acres and miles. It became the standard tool of English and American surveyors for centuries.
Law and Notable Facts
The chain underpins the US Public Land Survey System, in which section lines and township grids were laid out in chains. A cricket pitch measures exactly one chain (22 yards) between the wickets—a lasting everyday trace of the unit. The chain is now largely obsolete outside historical land records and cricket.
Real-World Examples and Conversions
- A cricket pitch is 1 chain = 22 yards = 66 ft long.
- 1 chain = 100 links = 4 rods = 20.1168 m.
- 80 chains = 1 statute mile.
- An acre is 1 chain by 10 chains (10 square chains).
What is the parsec?
The parsec (pc) is a unit of length used in astronomy to measure large distances to objects beyond the Solar System, such as stars and galaxies.
Definition
One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond.
By the 2015 IAU exact definition, 1 pc = 648000/π au = 30,856,775,814,913,673 m. This equals about 3.2616 light-years or 206,265 astronomical units.
Origin and History
The term "parsec"—a contraction of "parallax of one arcsecond"—was coined by British astronomer Herbert Hall Turner in 1913. It arises naturally from the method of stellar parallax: a star one parsec away shifts by one arcsecond against the background as Earth moves from one side of its orbit to the other. The unit gave astronomers a convenient measure tied directly to their primary distance-measuring technique.
Law and Notable Facts
The parsec is accepted for use with the SI in astronomy. Multiples are common: the kiloparsec (kpc, thousands of parsecs) for galactic scales and the megaparsec (Mpc, millions) for intergalactic distances. No star lies within one parsec of the Sun; Proxima Centauri, the nearest, is about 1.30 pc away.
Real-World Examples and Conversions
- Proxima Centauri lies about 1.30 pc (4.24 light-years) from Earth.
- The Milky Way's disk spans roughly 30,000 pc (30 kpc) across.
- The Andromeda Galaxy is about 0.78 Mpc away.
- 1 pc ≈ 3.2616 light-years ≈ 206,265 au ≈ 30.857 trillion km.
Frequently Asked Questions
How many parsecs are in one chain?
One chain equals about 6.519411 × 10⁻¹⁶ parsec, an extraordinarily small fraction.
How do I convert chains to parsecs?
Multiply the number of chains by 6.519411 × 10⁻¹⁶. Results are always in tiny exponential form.
How many chains are in one parsec?
Roughly 1.5339 × 10¹⁵ chains fit into a single parsec, underscoring the immense scale difference.
Is this conversion ever used practically?
No; it is purely an educational tool for comparing human-scale and astronomical distances.
What is 25 chains in parsecs?
25 chains equal about 1.629853 × 10⁻¹⁴ parsec.
People also convert
Complete chains conversion table
| Unit | Result |
|---|---|
| Nanometers (nm) | 20116800000 nm |
| Micrometers (μm) | 20116800 μm |
| Millimeters (mm) | 20116.8 mm |
| Centimeters (cm) | 2011.68 cm |
| Decimeters (dm) | 201.168 dm |
| Meters (m) | 20.1168 m |
| Kilometers (km) | 0.0201168 km |
| light-years (ly) | 2.126347e-15 ly |
| astronomical units (au) | 1.344725e-10 au |
| parsecs (pc) | 6.519411e-16 pc |
| ångströms (angstrom) | 201168000000 angstrom |
| Mils (mil) | 792000 mil |
| Inches (in) | 792 in |
| Yards (yd) | 22 yd |
| US Survey Feet (ft-us) | 65.99987 ft-us |
| Feet (ft) | 66 ft |
| Fathoms (fathom) | 11 fathom |
| Miles (mi) | 0.0125 mi |
| Nautical Miles (nMi) | 0.0108622 nMi |
| rods (rd) | 4 rd |
| furlongs (fur) | 0.1 fur |
| hands (hh) | 198 hh |