“It has to resonate.” Sagnac’s counter-rotating beams of light are analogous to beams in a linear cavity. If the turntable rotates clockwise, the beam traveling clockwise has farther to go ...

Donald E. Moore III Clock dials and clock-hand rotation were standardized in Western Europe by the end of the 17th century, but “clockwise” (rotating to the right) and “counterclockwise ...