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!

Astronomy in service of islam

Astronomy in service of islam

Moonsighting, islamic calendar, prayer times, and qibla direction