Moontool

John Walker's moontool.c astronomical calculation routines, extracted and ported to Rust.

Original

The original versions, moontool and moontoolw, are available at John Walker's fourmilab.ch.

Backup copies are included in the original/ directory of this repository.

License

Walker's program is in the public domain, and so is this project.

In Walker's words:

Do what thou wilt shall be the whole of the law.

CLI

This version includes functions that compute info about the Moon, in a way similar to the original program.

The CLI wraps these functions.

$ moontool 1994-12-22T13:53:34

Phase
=====

Julian date:            2449709.07887   (0h variant: 2449709.57887)
Universal time:         Thursday  13:53:34 22 December 1994
Local time:             Thursday  14:53:34 22 December 1994

Age of moon:            18 days, 22 hours, 29 minutes.
Lunation:               64.13%   (🌖 Waning Gibbous)
Moon phase:             81.56%   (0% = New, 100% = Full)

Moon's distance:        386212 kilometres, 60.6 Earth radii.
Moon subtends:          0.5157 degrees.

Sun's distance:         147151251 kilometres, 0.984 astronomical units.
Sun subtends:           0.5420 degrees.

Moon Calendar
=============

Last new moon:          Friday    23:54 UTC  2 December 1994    Lunation: 890
First quarter:          Friday    21:06 UTC  9 December 1994
Full moon:              Sunday     2:18 UTC 18 December 1994
Last quarter:           Sunday    19:07 UTC 25 December 1994
Next new moon:          Sunday    10:56 UTC  1 January 1995     Lunation: 891

Installation

# CLI, either of:
cargo install moontool
cargo install --git https://github.com/qrichert/moontool.git

# Library
cargo add moontool

This sets up both the CLI:

$ moontool --help

And the library:

use moontool::moon::MoonPhase;

let phase = MoonPhase::now();

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