# Thou to Parsecs (thou to pc)

Source: https://www.unitconvertercalculator.com/length/thou-to-parsecs/

**1 thou = 8.2315793951887E-22 pc**

One thou equals approximately 8.232 x 10-22 parsecs. A parsec contains about 1.215 x 1021 thou (about 1.2 sextillion). About 21 orders of magnitude separate workshop precision from stellar measurement. No wider gap exists between common imperial and astronomical units.

## Formula

Convert Thou to Parsecs

## Conversion Table

| Thou (thou) | Parsecs (pc) |
|---|---|
| 1 thou | 0 pc |
| 100 thou | 8.0E-20 pc |
| 10000 thou | 8.23E-18 pc |
| 1000000 thou | 8.2315E-16 pc |
| 100000000 thou | 8.231579E-14 pc |
| 10000000000 thou | 8.23157939E-12 pc |
| 1000000000000 thou | 8.2315793951E-10 pc |
| 100000000000000 thou | 8.231579395188E-8 pc |
| 10000000000000000 thou | 8.2315793951887E-6 pc |
| 1000000000000000000 thou | 0.00082315793951887 pc |
| 100000000000000000000 thou | 0.082315793951887 pc |

## Units

### Thou (thou)

One thousandth of an inch (0.0254 mm). Also called a mil in the US. Used in engineering, manufacturing, and for measuring thin materials like plastic film.

### Parsec (pc)

The distance at which one astronomical unit subtends an angle of one arcsecond. Approximately 3.26 light-years or 30.857 trillion kilometers. The standard unit in professional astronomy.

## Background

A parsec is about 1.2 sextillion thou. A 1-thou tolerance band is unimaginably small compared to parsec-scale distances. But telescope hardware assembled to thou precision observes objects at parsec distances. Thou build the tool; parsecs are the target.

## Good to Know

The Hubble mirror error of 0.08 thou (2 um) is the most expensive thou-level mistake in history. It cost $1.5 billion to fix with corrective optics. A fractional thou of polishing error at workshop-level produced blurry images at parsec-level observation. The thou-to-parsec link is not theoretical. It is a $1.5 billion lesson.

## FAQ

### How many parsecs is 1 thou?

One thou equals approximately 8.232 x 10-22 parsecs.

### How many thou are in 1 parsec?

One parsec contains approximately 1.215 x 1021 thou.

### Is this conversion used?

Never directly. But thou-precision telescope components observe parsec-scale objects.

## Non-Frequently Asked Questions

### Is thou-to-parsec the most absurd imperial conversion?

Possibly. A precision machining unit meeting a stellar astronomy unit produces a ratio of 1021. The number has 22 digits. Your brain cannot hold it. But the conversion exists because both units belong to legitimate professional measurement systems.

### How many thou has the Hubble Space Telescope mirror been polished to?

Hubble's mirror was polished to about 0.04 thou (1 um = about 0.04 thou) accuracy. Unfortunately, it was polished to the wrong shape by about 0.08 thou (2 um) - causing the famous spherical aberration. The corrective optics (COSTAR) fixed the error. A 0.08-thou mistake at thou-level caused a billion-dollar problem at parsec-level observation. Thou matter.

### If every thou of every part ever machined were a parsec, how far?

If humanity has machined about 1014 precision parts averaging 10,000 thou each, total machined-thou is about 1018. At 1 parsec per thou: 1018 parsecs = about 3.26 x 1018 light-years. The observable universe is about 46 billion light-years in radius = 1.4 x 1010 parsecs. So all machining in history, scaled to parsecs, exceeds the observable universe by a factor of 108. Machinists collectively exceed the cosmos.

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## See Also

- [Parsecs to Thou](https://www.unitconvertercalculator.com/length/parsecs-to-thou/)