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RRLyrBinCan database

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Candidates for binaries with RR Lyrae components.

sciences astronomy

GeoDirectory

Speed of light

Speed of light

From general relativity we know that only in local inertial frames does the measured speed of light equals the nominal speed of light (299792.458km/sec).

Wcs - the home of webcamscheinern

Wcs - the home of webcamscheinern

Wcs is a software for fast polaralignment of astronomical mounts. you nail your alignment within 20 minutes!

John wall

John wall inventor of crayford focuser.

Exospace bio

Animal, art, nature and space page