General Coordinates Network (GCN): NASA’s Next Generation Time-Domain and Multimessenger Astronomy Alert System

Calculate phase of the moon using Julian date

Astronomy/weather clock

A fairly comprehensive collection of accurate astronomical algorithms in JavaScript (TypeScript).

Simulation of the Prague Astronomical Clock for any location on Earth.

A Home Assistant card showing sun, moon, and planet visibility using Astronomy Engine

Lovalace Card for the AstroWeather Integration

observerly’s lightweight, zero-dependency, type-safe astrometry library for TypeScript. Accurately determine the positions of the Sun, Moon, and planets, handle coordinate transformations with ease, calculate transit times for any celestial object, and integrate precision astronomy into your projects with clean, dependency-free code.

Astronomy Picture of the Day (APOD) Chrome Extension for the new tab screen

Jelajahi alam semesta dengan gambar dan video astronomi yang luar biasa berbeda setiap harinya dengan penjelasan dari para pakar astronomi.

Provides web-based star charts and astronomical information.

Realtime dashboard of NASA/JPL communication with interplanetary spacecraft, made with Svelte.

AstroVista is a web app to explore NASA’s space images and videos, powered by NASA APOD.

A WebGL-based renderer for procedural generation of Earth-like planets

Astronomy FITS Viewer & Analysis Tool in the browser

Asteroids 🪨 that will make a close approach by Earth 🌏 today

observerly's Edge runtime API of stars, galaxies and other astronomical bodies, adhering to the OpenAAS standard.

The graphing tool for various astronomy curricula at UNC Chapel Hill and beyond.

Plugin for Obsidian to add the current Julian Date for astronomical observations

An interactive map of the Solar System