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Full Moon

Everything below is normally invisible. It is what search engines and LLMs read to decide whether to retrieve and cite this page.

About

Full Moon shows the current lunar phase, how illuminated the moon is right now, and the count of days until it's full again. On a full-moon night it says so.

How it works

The phase and illuminated fraction come from SunCalc's getMoonIllumination; the countdown uses the 29.53-day synodic month. Entirely client-side.

Metadata
title
Full Moon
description
Tonight’s moon phase and how lit it is — and how many days until the next full moon. Computed in the browser, no server.
canonical
https://kaspirius.com/full-moon
updated
Last updated
Heading outline
Structured data (JSON-LD)
TechArticle

Same as Article, flagged as technical/developer reference material.

{
  "@context": "https://schema.org",
  "@type": "TechArticle",
  "headline": "Full Moon — ritual",
  "description": "Tonight’s moon phase and how lit it is — and how many days until the next full moon. Computed in the browser, no server.",
  "url": "https://kaspirius.com/full-moon",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://kaspirius.com/full-moon"
  },
  "datePublished": "2026-06-18",
  "dateModified": "2026-06-18",
  "author": {
    "@type": "Person",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  },
  "publisher": {
    "@type": "Organization",
    "name": "kaspirius",
    "url": "https://kaspirius.com"
  }
}
↖ kaspirius