Of smaller size but which remains imposing and of different design, let us quote also the radio-telescope of Nançay of the CNRS installed in the Cher in France put in service in 1965. It replaces the two former parabolas-radars of 7.5 m of diameter today exposed at the Caen Memorial. Nançay is inspired by the …
Month: May 2018
It has been known since the discovery of Heinrich Hertz in 1887 that radio waves are of the same nature as light waves. In particular they propagate in a vacuum in a straight line (geodesic) at a constant speed of 299792.45 km / s. It is by their wavelength (or their frequency) that the hertzian …