---
name: "Geo::Constants"
section: "3pm"
platform: "linux"
package: "libgeo-constants-perl"
version: "0.07-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Geo::Constants"
---

# Geo::Constants(3pm)

Package for standard Geo:: constants.

## NAME

Geo::Constants - Package for standard Geo:: constants.

## SYNOPSIS

```
  use Geo::Constants qw{PI DEG RAD}; #import into namespace
  print "PI:  ", PI(), "\n";
  print "d/r: ", DEG(), "\n";
  print "r/d: ", RAD(), "\n";
  use Geo::Constants;                #Perl OO
  my $obj = Geo::Constants->new();
  print "PI:  ", $obj->PI, "\n";
  print "d/r: ", $obj->DEG, "\n";
  print "r/d: ", $obj->RAD, "\n";
```

## DESCRIPTION

## CONSTRUCTOR

### new

The **new()** constructor

```
  my $obj = Geo::Constants->new();
```

### initialize

## FUNCTIONS

### PI

```
  my $pi = $obj->PI;
  use Geo::Constants qw{PI};
  my $pi = PI();
```

### DEG

```
  my $degrees_per_radian = $obj->DEG;
  use Geo::Constants qw{DEG};
  my $degrees_per_radian = DEG();
```

UOM: degrees/radian

### RAD

```
  my $radians_per_degree = $obj->RAD;
  use Geo::Constants qw{DEG};
  my $radians_per_degree = RAD();
```

UOM: radians/degree

### KNOTS

1 nautical mile per hour = (1852/3600) m/s - United States Department of Commerce, National Institute of Standards and Technology, NIST Special Publication 330, 2001 Edition

Returns 1852/3600 m/s/knot

UOM: meters/second per knot

## AUTHOR

Michael R. Davis

## LICENSE

Copyright (c) 2006-2025 Michael R. Davis

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

## SEE ALSO

Geo::Functions, Geo::Ellipsoids, Astro::Constants