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Showing content from https://github.com/jasonsturges/lunarphase-js below:

jasonsturges/lunarphase-js: Calculate phase of the moon using Julian date

Calculate phase of the moon using Julian date.

To install, execute:

Then, import into a project and use as:

import { Moon } from "lunarphase-js";

const phase = Moon.lunarPhase();

This package provides for following distributables:

• CJS: CommonJS
• ESM: ES Modules
• UMD: Universal Module Definition (browser)
• IIFE: Immediately invoked function expression
• TypeScript declaration types

In the lunar calendar there are 8 phases each synodic month, which is the number of days to complete the cycle. This time between two identical syzygies is equivalent to 29.53059 Earth days.

Lunar phases, in order:

The following functions are exported from Moon:

Visit this repository's GitHub Pages for a live example: https://jasonsturges.github.io/lunarphase-js/

All functions default to the current date, as in "now":

import { Moon } from "lunarphase-js";

const phase = Moon.lunarPhase();

Otherwise, pass a date object to each function for a specific date.

import { Moon } from "lunarphase-js";

const date = new Date();
const phase = Moon.lunarPhase(date);

To get the current lunar phase from the LunarPhase enum (ex: "FULL")

const phase = Moon.lunarPhase();

To get the current lunar phase emoji from the LunarEmoji (ex: "🌕"):

const phaseEmoji = Moon.lunarPhaseEmoji();

As phases are inverted between Northern and Southern Hemispheres, optionally pass Hemisphere options.

import { Hemisphere, Moon } from "lunarphase-js";

const date = new Date();
Moon.lunarPhaseEmoji(date, {
  hemisphere: Hemisphere.SOUTHERN,
});

To get emoji for other lunar phases, pass a LunarPhase enum:

import { LunarPhase, Moon } from "lunarphase-js";

const emoji = Moon.emojiForLunarPhase(LunarPhase.FULL);

Optionally pass a Hemisphere to the function:

import { Hemisphere, LunarPhase, Moon } from "lunarphase-js";

const emoji = Moon.emojiForLunarPhase(LunarPhase.FULL, {
  hemisphere: Hemisphere.SOUTHERN,
});

Whether the moon is waxing (ex: false)

const waxing = Moon.isWaxing();

Whether the moon is waning (ex: true)

const waning = Moon.isWaning();

Age in Earth days through the current lunar cycle, equivalent to 29.53059 Earth days, based on Mean Synodic Month, 2000 AD mean solar days.

To get the lunar age (ex: 16.54412413414952)

const age = Moon.lunarAge();

To get the percentage through the lunar cycle (ex: 0.5602368519132597)

const agePercent = Moon.lunarAgePercent();

Brown Lunation Number (BLN), per Ernest William Brown's lunar theory, defining Lunation 1 as the first new moon of 1923 at approximately 02:41 UTC, January 17, 1923

const lunationNumber = Moon.lunationNumber();

Distance to the moon measured in units of Earth radii, with perigee at 56 and apogee at 63.8.

const distance = Moon.lunarDistance();

Convert to and from Gregorian Dates to Julian Days via the Julian module.

API Reference:

To convert a date to Julian day:

import { Julian } from "lunarphase-js";

const date = new Date();
const julian = Julian.fromDate(date);

To convert a Julian day to a date:

import { Julian } from "lunarphase-js";

const julian = 2459356.529302257;
const date = Julian.toDate(julian);

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