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To convert pc to light-years: multiply by 3.2616. To convert pc to AU: multiply by 206,265.
1 pc = 3.0857 × 10¹⁶ m = 3.2616 ly = 206,265 AU ≈ 30.857 trillion km.
For example, 1 Parsec (pc) = 3.085700e+15 Decameter (dam).
| Parsec (pc) | Decameter (dam) |
|---|---|
| 0.1 | 3.085700e+14 |
| 0.5 | 1.542850e+15 |
| 1 | 3.085700e+15 |
| 2 | 6.171400e+15 |
| 5 | 1.542850e+16 |
| 10 | 3.085700e+16 |
| 25 | 7.714250e+16 |
| 50 | 1.542850e+17 |
| 100 | 3.085700e+17 |
| 500 | 1.542850e+18 |
| 1000 | 3.085700e+18 |
The parsec is an astronomical unit of length defined as the distance at which one astronomical unit subtends an angle of one arcsecond.
1 pc = 3.0857 × 10¹⁶ m = 3.2616 ly = 206,265 AU ≈ 30.857 trillion km.
To convert pc to light-years: multiply by 3.2616. To convert pc to AU: multiply by 206,265.
Stellar catalogs, galaxy surveys, and cosmological distance calculations.
No known star is within 1 parsec of the Sun. Proxima Centauri is 1.30 pc away, making it the nearest star.
Pronouncing or interpreting 'parsec' as a unit of time (famously misused in Star Wars). It is strictly a distance unit.
The parsec is defined geometrically: if a star's parallax (apparent shift over 6 months) is 1 arcsecond, it's 1 pc away.
The decameter (or dekameter) is a unit of length equal to 10 meters.
1 dam = 10 m = 0.01 km = 1,000 cm. One hectare = 100 m × 100 m = 10 dam × 10 dam.
To convert dam to meters: multiply by 10. To convert dam to feet: multiply by 32.8084.
Occasionally used in plot/field dimensions in agriculture and in some European forestry measurements.
The decameter is one of the least-used SI prefixed units. Most people skip from meters to hectometers or kilometers.
Confusing 'dam' (decameter) with 'dm' (decimeter) — they differ by a factor of 100.
Remember: deca = 10, deci = 0.1. They're opposite prefixes — deca makes larger, deci makes smaller.



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