sciences astronomy

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).
www.speed-light.info

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

Steve rismiller
Solar astronomy

Tatasurya
Planets, science, refrencess

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

Ismael camacho arango
It's about his life and work

Pinoy folks
Online convergence of filipinos around the world.

My eart & sky
Colection of works of sciencse by the images

Brixiis astronomical observatory - belgium
The brixiis observatory is a privat astronomical observatory that you can find in kruibeke, belgium. about 10 km south of antwerp near the river 'de schelde”. the observatory is running an operated ...

John wall
John wall inventor of crayford focuser.