moontool
Get information about the moon, in javascript.
The source of algorithms comes from Moontool for Windows, which the source of the application has been copied to this repo in /original for safekeeping/archival.
Methods available
| Method | Returns |
|---|---|
| getMoonInfo(date) | Returns information about the moon on a given date |
| getEaster(year) | Returns the date of Easter for a given year |
Examples
getMoonInfo(new Date());
// Result
{
angularDiameterInDeg: 0.5227003811621781,
distanceInKm: 381017.8168555941,
distanceToSun: 149979823.99030265,
moonAgeInDays: 8.807861270471863, // min 0, max 29.53
moonIllumination: 0.6493074320692747, // 0 new moon, 1 full moon
moonPhase: 0.298262298998364, // percentage of the current phase of the moon (new moon (0) > full moon > new moon (1))
sunAngularDiameter: 0.5317725210369415
}getEaster(2020); // -> Sun Apr 12 2020Usage
This package works both in CJS / ESM formats.
const moontool = require("@mrspade/moontool");
moontool.getEaster(2020);
// or
import { getMoonInfo } from "@mrspade/moontool";
getMoonInfo(new Date());Building locally
npm i
Package
Ensure you have ran npm i
Run npm run build