Turn your phone into a professional pocket planetarium.

Constellation Cards — Night Sky Guide is a beautifully designed, offline-ready educational suite engineered for students, amateur astronomers, and night-sky explorers alike. Blending classic astronomical charts with interactive modern tools, this app is your perfect companion under the stars—whether you are observing from a bright city balcony or a pristine wilderness dark-site.

🌟 Key Features

Ultimate Stellar Blueprint Library: Dive into beautiful, clean cards mapping out the night sky's most famous constellations. Explore stars, parent shapes, and astronomical classifications offline.

Pro Observation Planner & Bortle Calculator: Planning a stargazing night? Enter your latitude and select your local Bortle Scale index. The app automatically calculates sky clarity and forecasts the visibility of upcoming celestial events.

Interactive Star Explorer & Spec Sheet: Tap any star on our custom-rendered interactive maps to immediately retrieve its distance in light-years, apparent magnitude, and spectral class.

Hertzsprung-Russell Evolutionary Diagrams: Visually track stellar evolution! Learn whether a selected star is a stable Main Sequence traveler, a expanding Red Giant, or a dying Supergiant.

Telescope Eyepiece Simulator: Test the exact field of view (FOV) of focal lenses ranging from 25mm wide-angle lenses to high-magnification 4mm planetary lenses, complete with simulated atmospheric turbulence jitter.

360° Viewfinder & Horizon Radar: Sweep the local sky dome using manual drag gestures. Rotate, lock on to coordinate alignments, and resolve Right Ascension (RA) and Declination (Dec) boundaries instantly.

Gamified Quiz & 3D Flashcards: Study star layout paths using smooth 3D-flipping digital flashcards, then test your knowledge in customized quiz modes covering mythology, coordinates, and star classes.

Audio Planetarium Mythology Tours: Listen to beautifully animated audio tours detailing the rich mythologies and history behind legendary star figures.

⚙️ Built for True Astronomers

Scotopic Night-Vision Mode: Protect your eyes! Activate our high-contrast monochromatic crimson-red display interface. Perfect for preventing rod cell bleaching and preserving natural scotopic vision during dark-site observations.

24H Rise & Set Transit Graphs: Track precisely