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Real‑Time Sky Map – Online Interactive Tonight's Stars

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Drag to rotate • Scroll to zoom • Hover stars for info
Bright star Medium Cool star —— Ecliptic — Constellation line ☽ Moon

Frequently Asked Questions

How accurate is this real-time sky map?

This interactive sky map uses precise astronomical calculations based on your local time, latitude, and longitude. Star positions are computed using sidereal time and coordinate transformations from equatorial to horizontal (altitude/azimuth) coordinates. Brightness and colors reflect actual stellar magnitudes and spectral types. The Moon's position uses a simplified ephemeris accurate to within ~1°.

Can I use this to identify stars and constellations in the night sky?

Absolutely! The map shows what's currently above your horizon. Hold your device facing the direction indicated on the map (North is at the top by default). The brightest stars are drawn larger, and constellation lines connect the major star patterns. Tap or hover over any bright star to see its name.

Why do some stars appear to move while others stay fixed?

Stars appear to rotate around the celestial poles due to Earth's rotation. This map updates in real-time, so you'll notice stars near the horizon slowly shifting position. Stars near the celestial pole (like Polaris in the Northern Hemisphere) barely move, making them excellent navigation references.

What do the different star colors mean?

Star colors on this map approximate their real spectral types: bluish-white stars (like Sirius and Vega) are very hot (>10,000K), yellow-white stars (like the Sun) are medium temperature (~5,500K), and orange-red stars (like Betelgeuse and Antares) are cooler (<4,000K). These colors are visible to the naked eye under dark skies.

How do I change my location to see the sky from another city?

You can select a preset city from the dropdown menu, or manually enter latitude and longitude coordinates and click the check button. The tool will also attempt to detect your location automatically using browser geolocation (you'll be prompted for permission). Coordinates range from -90° to 90° for latitude and -180° to 180° for longitude.

What is the ecliptic line and why is it important?

The ecliptic (shown as a golden dashed line when enabled) marks the Sun's apparent path across the sky throughout the year. The Moon and planets always appear near this line. If you see a bright "star" along the ecliptic that isn't on the map, it's likely a planet like Venus, Jupiter, or Mars.

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