Finger to Parsec Conversion Calculator: Free Online Tool
Convert fingers to parsecs with our free online length converter.
Finger to Parsec Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Finger).
- The converted value in Parsec will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Length category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Finger to Parsec
Converting Finger to Parsec involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Finger = 3.7042e-18 parsecsExample Calculation:
Convert 10 fingers: 10 × 3.7042e-18 = 3.7042e-17 parsecs
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Finger and a Parsec?
The Finger (sometimes finger's breadth, though this can be confusingly similar to the 'digit') is an archaic English unit of length. Its definition was inconsistent, leading to significant ambiguity. Two primary definitions existed:
-
As 1/8th of a yard: This was a common definition, equating the finger to:
- 4.5 inches (in)
- 1/2 of a quarter-yard (or "quarter")
- 0.1143 meters (m)
- 11.43 centimeters (cm)
-
As 1/16th of a yard: This definition made the finger identical to another unit called the nail, equating it to:
- 2.25 inches (in)
- 0.05715 meters (m)
- 5.715 centimeters (cm)
The term likely originated from anthropomorphic measurement but became tied to fractions of the standard yard, particularly in the context of measuring cloth. It is distinct from, and generally longer than, the unit called a digit (typically ~0.75 inches).
The Parsec (symbol pc) is a unit of length used to measure the enormous distances to astronomical objects outside the Solar System. One parsec is defined as the distance at which one astronomical unit (AU) – the average distance between the Earth and the Sun – subtends an angle of one arcsecond (1/3600th of a degree). This corresponds to approximately:
- 3.0857 × 10¹⁶ meters (m)
- 30.857 trillion kilometers (km)
- 19.174 trillion miles (mi)
- 206,264.8 astronomical units (AU)
- 3.26156 light-years (ly)
It is derived directly from the method of trigonometric parallax used by astronomers to measure stellar distances.
Note: The Finger is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Parsec belongs to the imperial/US customary system.
History of the Finger and Parsec
The finger was used historically in England, primarily from the medieval period into the early modern era. Its main application was in the measurement of cloth, alongside other specialized units like the nail (often 2.25 inches) and the ell (often 45 inches).
The existence of multiple definitions (4.5 inches vs. 2.25 inches) highlights the lack of strict standardization for many older units. The 2.25-inch finger was identical to the nail, suggesting the terms might have been used interchangeably in some contexts or that one definition arose from confusion with the other.
Compared to more fundamental units like the inch, foot, yard, or even the digit and palm, the "finger" as a distinct unit (especially the 4.5-inch version) appears less frequently in historical records. Its usage declined significantly with the standardization of the Imperial system (which favored inches and yards) and the later adoption of the metric system. It is now entirely obsolete.
The concept of measuring stellar distances via parallax existed long before the unit itself. The term "parsec" was coined by the British astronomer Herbert Hall Turner in 1913. He sought a convenient unit for astronomers that directly reflected the observational method. The name is a portmanteau derived from "parallax of one arcsecond". It quickly gained acceptance within the astronomical community due to its practical connection to parallax measurements, which were (and still are) a fundamental way to determine distances to nearby stars.
Common Uses for fingers and parsecs
Explore the typical applications for both Finger (imperial/US) and Parsec (imperial/US) to understand their common contexts.
Common Uses for fingers
The finger is obsolete and has no modern practical application. Its relevance is primarily historical:
- Historical Cloth Trade: Measurements in "fingers" might be encountered in older English documents, inventories, or tailor's records related to textiles. Understanding its potential ambiguity (4.5 vs 2.25 inches) is crucial.
- Understanding Historical Units: Studying the finger helps illustrate the complexity and variability of pre-standardized measurement systems and the specific units used in the textile industry.
- Rare & Obsolete: It was never as widespread or consistently defined as units like the inch, foot, or yard.
Common Uses for parsecs
The parsec is the preferred unit of distance in professional astronomy and astrophysics:
- Stellar Distances: Measuring distances to nearby stars using parallax.
- Galactic Structure: Describing distances within the Milky Way galaxy (often using kiloparsecs, kpc, where 1 kpc = 1000 pc). For example, the Sun is about 8 kpc from the Galactic Center.
- Extragalactic Distances: Measuring distances to other galaxies and galaxy clusters (often using megaparsecs, Mpc, where 1 Mpc = 1,000,000 pc). The Hubble constant, describing the expansion of the universe, is typically expressed in (km/s)/Mpc.
- Cosmology: Discussing large-scale structures and distances in the universe (using Mpc and sometimes gigaparsecs, Gpc, where 1 Gpc = 1000 Mpc).
Frequently Asked Questions
Questions About Finger (finger)
How long is a Finger?
The length of a finger was not consistently defined. The two most common historical definitions in England were:
- 4.5 inches (11.43 cm), equal to 1/8th of a yard.
- 2.25 inches (5.715 cm), equal to 1/16th of a yard (and identical to the unit called a 'nail'). Context is essential when encountering this unit in historical texts.
Is a Finger the same as a Digit?
No. Although both terms relate to the human finger, they represented different historical units of length.
- The Digit (or fingerbreadth) was typically much shorter, around 0.75 inches (approx. 1.9 cm), representing the width of a finger.
- The Finger was significantly longer, either 4.5 inches or 2.25 inches, likely derived as a fraction of a yard rather than directly from finger anatomy in later usage.
What is the relationship between a Finger and a Nail?
The unit called a Nail was commonly defined as 1/16th of a yard (2.25 inches). Therefore:
- One definition of the Finger (2.25 inches) was identical to the Nail.
- The other common definition of the Finger (4.5 inches) was twice the length of a Nail.
Is the Finger an SI unit?
No, the finger is not an SI unit. It is an archaic, non-standardized unit primarily used historically in England. The SI base unit for length is the meter (m).
Is the Finger still used?
No, the finger as a unit of length is completely obsolete and is not used in any modern standard, scientific, or commercial measurements. Its relevance is purely historical.
Where does the name 'Finger' come from?
The name undoubtedly originates from the human finger. However, while the digit unit directly related to finger width, the 'Finger' unit (especially the 4.5-inch version) seems to have become a conventional term for a specific fraction (1/8th or 1/16th) of a yard, particularly in cloth measurement, losing its direct anatomical connection.
About Parsec (pc)
What does 'Parsec' stand for?
Parsec is a blend of "parallax of one arcsecond". It represents the distance at which the parallax angle of a star is exactly one second of arc.
How is a parsec defined?
It's defined based on trigonometry. Imagine a right-angled triangle in space where the short side is the Earth-Sun distance (1 AU). The parsec is the length of the adjacent side when the angle at the distant star (the parallax angle) is exactly one arcsecond.
Is a Parsec bigger than a Light Year?
Yes, one parsec is significantly larger than one light-year.
- 1 Parsec ≈ 3.26 light-years
How many meters or kilometers are in a parsec?
One parsec is approximately:
- 3.0857 × 10¹⁶ meters
- 30.857 trillion kilometers
How many Astronomical Units (AU) are in a parsec?
One parsec is equal to approximately 206,265 AU. This number arises directly from the definition involving radians and arcseconds (specifically, the number of arcseconds in a radian).
Why do astronomers use parsecs instead of light-years?
While both are used, parsecs are often preferred in professional contexts because:
- Direct Observational Link: The parsec is derived directly from the parallax angle, a primary method for measuring distance.
- Historical Convention: It became the standard unit early in the development of stellar distance measurement.
- Convenience: Multiples like kpc and Mpc provide convenient scales for galactic and extragalactic distances.
- Definition Stability: The definition of a light-year depends slightly on the definition of a "year" (e.g., Julian year), whereas the parsec is based on the fixed AU and geometric angles.
Is the parsec an SI unit?
No, the parsec is not an SI unit. The SI unit for length is the meter (m). However, the parsec (along with the astronomical unit and light-year) is recognized by the International Astronomical Union (IAU) and is widely accepted for use in astronomy.
Conversion Table: Finger to Parsec
| Finger (finger) | Parsec (pc) |
|---|---|
| 1 | 0 |
| 5 | 0 |
| 10 | 0 |
| 25 | 0 |
| 50 | 0 |
| 100 | 0 |
| 500 | 0 |
| 1,000 | 0 |
All Length Conversions
Other Units from Length
- Meter (m)
- Kilometer (km)
- Hectometer (hm)
- Decimeter (dm)
- Centimeter (cm)
- Millimeter (mm)
- Inch (in)
- Foot (ft)
- Yard (yd)
- Mile (mi)
- Nautical Mile (NM)
- Micrometer (μm)
- Nanometer (nm)
- Light Year (ly)
- Astronomical Unit (AU)
- Angstrom (Å)
- Point (Typography) (pt)
- Mil/Thou (mil)
- Fathom (fath)
- Furlong (fur)
- Link (Gunter's) (li)
- Pace (pace)
- Span (span)
- Digit (digit)
- Cable Length (cb)
- Ell (ell)
- Roman Mile (m.p.)
- Stadion (stadion)
- Chi (Chinese) (chi)
- Shaku (Japanese) (shaku)
- Li (Chinese) (li)
- Toise (toise)
- Bolt (bolt)
- Rope (rope)
- Smoot (smoot)
- Sajene (sajene)
- Ken (ken)
- Wa (wa)
- Vara (vara)
- Aln (aln)
- Cubit (Royal/Egyptian) (cubit)
- Versta (versta)
- Arpent (arpent)
- Ri (Japanese) (ri)
- Klafter (klafter)
- Yojana (yojana)
- Skein (skein)