The science behind every map
We publish our sources and our limits, because a map you can trust is worth more than one that only claims to be accurate.
The star catalog
We plot stars down to magnitude 6.5 — the limit of the naked eye — from the HYG catalog (Hipparcos, Yale Bright Star and Gliese), roughly 9,000 stars, each with precise position and brightness.
The math
We compute local sidereal time and transform each star from catalog coordinates to the horizon (altitude/azimuth) for your exact latitude, longitude, date and time, then draw them with a stereographic projection.
The constellations
All 88 official IAU constellations, drawn from standard line data, plus the Milky Way band positioned for your sky.
Honest limits
We support dates from 1900 to 2100. Beyond that range, precession and proper motion make a naked-eye map less faithful, so we stop rather than pretend.
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