Moontool

John Walker's moontool.c astronomical calculation routines, extracted.

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

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⠀⠀⠀⠀⠀⠀⣠⠶⡥⠤⠖⠢⠴⢭⠭⡖⢔⠦⣤⡀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠔⠓⢱⣎⣵⠚⠀⠀⠀⠀⠉⢿⣁⣷⣿⠙⢆⠀⠀⠀⠀⠀⠀⠀
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⠀⢠⡋⠀⡄⠁⠀⡢⣀⠰⣀⠂⠀⣀⣠⢉⠄⠀⠀⠀⠑⠀⠀⠀⠀⠀⠀⠀
⠀⣮⣥⠀⠀⢰⣁⣱⢈⡆⢘⣕⠂⠂⠀⠈⠈⡶⠢⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⣇⢹⣇⢀⠀⠀⢉⢤⢛⡏⠥⡀⠘⠲⢤⣼⡕⠀⠀⢀⣄⠄⠀⠀⠀⠀⠀
⠈⣿⢿⣳⣮⣀⡀⠳⠌⠀⠻⢠⣼⠷⡎⢩⠉⠔⢠⠀⠾⠿⡅⠀⠀⠀⠀⠀
⠀⣟⡿⠟⣏⠀⠉⢐⠥⠁⠀⠉⣴⠡⡩⡩⢡⣿⡒⣄⣀⣼⡇⠀⠀⠀⠀⠀
⠀⠸⣏⢘⢸⣆⡀⠂⡨⡂⠤⡼⢁⠽⣉⣴⣟⢻⣮⣾⡂⡷⠂⠀⠀⠀⠀⠀
⠀⠀⠹⡮⡍⣙⠧⣑⡀⠊⠀⠃⠁⢖⣡⣶⡿⢯⠽⣖⣖⡄⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠈⢮⡛⠭⣽⣥⠶⠀⡀⠀⢒⢶⣶⣿⡿⣿⣿⠟⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠉⠻⣍⡂⡴⡷⠲⠸⢞⠶⡤⣿⢿⡋⠋⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠉⠒⠳⠤⠤⠌⠁⠩⠌⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
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