1 October 2013 A method of comparing the speed of starlight and the speed of light from a terrestrial source
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The speed of light is an important physical parameter. Currently it is a common belief of the constance of the speed of light regardless of the relative velocity between the source and the observer. Because the speed of light is very fast, if the relative velocity is small compared with the speed of light, it is difficult to detect the effect of the relative velocity on the measurement of the speed of light. In this paper we present a method of comparing the speeds of starlight and the light emitting from a terrestrial source. We use a telescope to collect the light from the star having significant relative velocity with respect to the earth, e.g. Capella. Then we modulate the starlight and the light emitted from the local source into pulses i.e. these pulses leave the modulator simultaneously. After travelling 4.2 km, these pulses are detected by a receiver. If the starlight and the terrestrial light have the same speed, then these pulses must arrive at the receiver at the same time. Our results show that the arrival times of the pulses of starlight are different from that of the local light. For example, the Capella is leaving away from the earth. The Capella pulses arrive later than the local light pulses. It indicates that the speed of Capella starlight is slower than the common believed value, c. The presented method uses one clock and one stick, so the clock synchronization problem and any physical unit transformation can be avoided.
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Jingshown Wu, Jingshown Wu, Shenq-Tsong Chang, Shenq-Tsong Chang, Hen-Wai Tsao, Hen-Wai Tsao, Yen-Ru Huang, Yen-Ru Huang, San-Liang Lee, San-Liang Lee, Cheng-Chieh Chang, Cheng-Chieh Chang, Wei-Cheng Lin, Wei-Cheng Lin, Ho-Lin Tsay, Ho-Lin Tsay, Yi-Lung Wang, Yi-Lung Wang, Po-Hsuan Huang, Po-Hsuan Huang, Ming-Ying Hsu, Ming-Ying Hsu, Chia-Wei Hsu, Chia-Wei Hsu, Shu-Chuan Lin, Shu-Chuan Lin, Yung-Jr Hung, Yung-Jr Hung, Ye-Li Shiu, Ye-Li Shiu, Yung-Chung Hsiao, Yung-Chung Hsiao, Je-Yuan Chang, Je-Yuan Chang, Din Ping Tsai, Din Ping Tsai, Ting-Ming Huang, Ting-Ming Huang, Hong-Tsu Young, Hong-Tsu Young, Yi-Cheng Liu, Yi-Cheng Liu, Chung-Min Chang, Chung-Min Chang, Wei-Chieh Chiang, Wei-Chieh Chiang, Ji-Ying Huang, Ji-Ying Huang, Ya-Hsin Chen, Ya-Hsin Chen, } "A method of comparing the speed of starlight and the speed of light from a terrestrial source", Proc. SPIE 8832, The Nature of Light: What are Photons? V, 883203 (1 October 2013); doi: 10.1117/12.2023127; https://doi.org/10.1117/12.2023127


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