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An astronomy site with more than 200 000 visits from the date of creation. A lot of observations (many unique), pictures and videos especially about the Sun in h-alpha wavelength and the planets of the solar system. ISS high resolution tracking is developed too ! A place is reserved for 3D experiences and pictures including original approaches like the single-mirror and W3BPS systems ...
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 is a software for fast polaralignment of astronomical mounts. you nail your alignment within 20 minutes!