Astrolabe

the sky, computed — DE440, IAU 2006/2000A, IERS

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Computing…

Positions from JPL DE440; precession and nutation on IAU 2006/2000A; Earth orientation and ΔT from the IERS. Constellation boundaries after Roman (1987); meteor shower data from the IMO; satellite elements from Celestrak. Star positions via SIMBAD/CDS.
Times are shown in the local time of the place being described, not the reader's. Altitudes are given both ways — geometric, which the mathematics knows exactly, and apparent, which includes refraction and depends on air the service cannot measure.

© 2026 CyberLogix Innovations. Astrolabe computes every figure on this page from first principles on its own machine - nothing here is fetched from somebody else's almanac.