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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).

Astronomy in service of islam *
Moonsighting, islamic calendar, prayer times, and qibla direction

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

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