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Volume 23: Pages 405-412, 2010

The velocity of electromagnetic wave is observed differently depending on the observer’s velocity

Masanori Sato ¹

¹Honda Electronics Co., Ltd., 20 Oyamazuka, Oiwa-cho Toyohashi, Aichi 441-3193, Japan

The Sagnac effect in global positioning system data provides experimental evidence that the group velocity is observed differently due to the velocity of the observer. The group velocity of the electromagnetic wave c_G is observed differently depending on the observer’s velocity v, as c_G=c±v (c is the speed of light; + indicates that c and v are in the opposite direction).

Keywords: The Theory of Relativity, The Global Positioning System (GPS), Sagnac Effect, The Earth-Centered Locally Inertial (ECI) Coordinate System, Selleri’s Arguments

Received: November 5, 2009; Accepted: May 22, 2010; Published Online: June 28, 2010