moon-phases

Command-line application to show the moon phase for a given date and time, as a text string, emoji, or numeric value. It can also show the moon sign.

Designed to be fast, for use in window manager bars, shell prompts and the like. (On a raspberry pi 4, latency has been under 10ms for all modes; on a modern desktop, under 1.5ms.)

Based on the Schaefer algorithm as implemented by Fallen4Eyes's crate moon-phase. Accepts dates in any format from crate human-date-parser, such as:

• "2023-10-31"
• "2023-10-31 13:12:00"
• "Friday"
• "next Friday"
• "in a month"
• "a year ago"

Includes an option to set Unicode variation characters for colour emoji or monochrome text. See --help for documentation.

Examples

$ moon-phases
Waning Gibbous
$ moon-phases 2023-10-31
Full
$ moon-phases --emoji  # color or monochrome left for system to decide
🌕
$ moon-phases --text-emoji # displays as monochrome in browsers etc.
🌕︎
$ moon-phases --face-emoji "in 7 days"
🌜
$ moon-phases --numeric
0.60
$ moon-phases --numeric "next Friday"
0.94
$ moon-phases --zodiac
Taurus
$ moon-phases --zodiac --emoji
♉

TODO

• Calendar display
• Translations for moon phase names

BUGS

Panicking when passed dates out of range rather than gracefully exiting (reported to human-date-parser technologicalMayhem/human-date-parser#1 )