moon-data

Daily moon phases in csv and scripts to calculate lunar data.

moon_phases_UTC_1800-2050.csv

Implementation used to calculate data available in this repo, see moon_data_ephem.py

The csv has one entry per day from 1800 until 2050. Each daily entry has 4 columns with the following info:

Date

In UTC following ISO 8601 format (YEAR-MONTH-DAY), e.g. 2024-10-04 for the 4rd of October of 2024.

Area

Ratio of illuminated area of moon's surface. 1.0 means maximum (full), and 0.0 means completely dark (new).

Category

Numerical description of moon's phase. Its range is 0-7 and matches this description.

• 0 = 🌑 (New Moon).
• 1 = 🌒 (Waxing Crescent Moon).
• 2 = 🌓 (First Quarter Moon).
• 3 = 🌔 (Waxing Gibbous Moon).
• 4 = 🌕 (Full Moon).
• 5 = 🌖 (Waning Gibbous Moon).
• 6 = 🌗 (Last Quarter Moon).
• 7 = 🌘 (Waning Crescent Moon).

Phase

Ratio of current moon cycle using next_new_moon relative to previous_new_moon and ephem Python's library. 0.0 would mean the phase just started and 1.0 it ended. Therefore, 0.5 means full moon, 0.25 First Quarter Moon and 0.75 Last Quarter Moon.

Python scripts

moon_data_ephem.py

Script used to calculate moon_phases_UTC_1800-2050.csv. It relies on ephem Python's library.

moon_data_no_libs.py

Script which does not depend on external libraries. Its calculations for moon phases may not be as accurate as those above, but are useful if there's no access to pip and/or faster calculations are needed.