A perch, also known as a rod or pole, is a historical length unit equal to 16.5 feet or 5.0292 metres, mainly used in old land surveying.

What does Earth's polar radius represent?

Earth's polar radius is the distance from Earth's center to the geographic pole along its rotation axis, corresponding to the semi-minor axis of a reference ellipsoid.

Why convert perch to Earth's polar radius?

This conversion helps relate small, historical land measurements to large-scale geodetic parameters for mapping, satellite modeling, and comparative Earth science.

How to Convert from Perch to Earth's Polar Radius

A detailed guide on converting lengths from the historical unit perch to Earth's polar radius, including definitions, use cases, and conversion examples.

Perch

Earth's polar radius

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Perch to Earth's polar radius Conversion Table

Perch	Earth's polar radius

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

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Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Perch to Earth's polar radius Conversion Table
Perch	Earth's polar radius

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What Is This Tool?

This converter allows users to transform measurements from perch, a traditional unit of length used primarily in land surveying, into Earth's polar radius, a geodetic constant representing the distance from Earth's center to its geographic pole.

How to Use This Tool?

Enter the length value in perch into the input field.
Select perch as the original unit and Earth's polar radius as the target unit.
Click the convert button to see the equivalent measurement in Earth's polar radius.

Key Features

Convert historical survey measurements in perch to planetary scale distances.
Provides a precise conversion factor based on geodetic reference ellipsoids.
Supports interpretation of older property records with modern geodetic units.

Examples

1 perch equals 7.9115564381133e-7 of Earth's polar radius.
10 perch converts to 7.9115564381133e-6 of Earth's polar radius.

Common Use Cases

Converting old land measurements from property deeds to modern geodetic units.
Relating small terrestrial survey lengths to Earth-scale measurements for geodetic analysis.
Applying the conversion in satellite navigation and Earth shape modeling studies.

Tips & Best Practices

Ensure unit consistency when comparing perch with Earth's polar radius.
Use this conversion when working with historical survey or cadastral data.
Interpret very small conversion results carefully in scientific or legal contexts.

Limitations

Perch is an outdated unit and may lead to precision inconsistencies.
Results are very small values due to Earth's polar radius being a large constant, limiting everyday usefulness.
Care is needed to apply conversions correctly within scientific or legal frameworks.

Frequently Asked Questions

What is a perch?: A perch, also known as a rod or pole, is a historical length unit equal to 16.5 feet or 5.0292 metres, mainly used in old land surveying.
What does Earth's polar radius represent?: Earth's polar radius is the distance from Earth's center to the geographic pole along its rotation axis, corresponding to the semi-minor axis of a reference ellipsoid.
Why convert perch to Earth's polar radius?: This conversion helps relate small, historical land measurements to large-scale geodetic parameters for mapping, satellite modeling, and comparative Earth science.

Key Terminology

Perch: A historical unit of length equal to 16.5 feet (5.0292 metres), mainly used in surveying and land measurement.
Earth's Polar Radius: The distance from Earth's center to the mean geographic pole, representing the semi-minor axis of a reference ellipsoid.
WGS84: A widely used geodetic reference ellipsoid that defines Earth's shape for mapping and GPS.

Quick Knowledge Check

What is the length of one perch in feet?

10 feet

16.5 feet

20 feet

Earth's polar radius corresponds to which of the following?

Distance from center to equator

Distance from center to geographic pole

Distance around the equator

Why might converting perch to Earth's polar radius yield very small numbers?

Because perch is a very large unit

Because Earth's polar radius is a very large constant

Because both units are almost equal in size

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