A method of comparing the speed of starlight and the speed of light from a terrestrial source

Jingshown Wu; Shenq Tsong Chang; Hen Wai Tsao; Yen Ru Huang; San Liang Lee; Cheng Chieh Chang; Wei Cheng Lin; Ho Lin Tsay; Yi Lung Wang; Po Hsuan Huang; Ming Ying Hsu; Chia Wei Hsu; Shu Chuan Lin; Yung Jr Hung; Ye Li Shiu; Yung Chung Hsiao; Je Yuan Chang; Din Ping Tsai; Ting Ming Huang; Hong Tsu Young; Yi Cheng Liu; Chung Min Chang; Wei Chieh Chiang; Ji Ying Huang; Ya Hsin Chen

doi:10.1117/12.2023127

A method of comparing the speed of starlight and the speed of light from a terrestrial source

Jingshown Wu, Shenq Tsong Chang, Hen Wai Tsao, Yen Ru Huang, San Liang Lee, Cheng Chieh Chang, Wei Cheng Lin, Ho Lin Tsay, Yi Lung Wang, Po Hsuan Huang, Ming Ying Hsu, Chia Wei Hsu, Shu Chuan Lin, Yung Jr Hung, Ye Li Shiu, Yung Chung Hsiao, Je Yuan Chang, Din Ping Tsai, Ting Ming Huang, Hong Tsu YoungYi Cheng Liu, Chung Min Chang, Wei Chieh Chiang, Ji Ying Huang, Ya Hsin Chen

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Title of host publication	The Nature of Light
Subtitle of host publication	What are Photons? V
DOIs	https://doi.org/10.1117/12.2023127
Publication status	Published - Aug 2013
Externally published	Yes
Event	The Nature of Light: What are Photons? V - San Diego, CA, United States Duration: 26 Aug 2013 → 29 Aug 2013

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	8832
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	The Nature of Light: What are Photons? V
Country/Territory	United States
City	San Diego, CA
Period	26/08/13 → 29/08/13

Keywords

PMT
rotating mirror
speed of light
starlight

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

More information

10.1117/12.2023127

Cite this

Wu, J., Chang, S. T., Tsao, H. W., Huang, Y. R., Lee, S. L., Chang, C. C., Lin, W. C., Tsay, H. L., Wang, Y. L., Huang, P. H., Hsu, M. Y., Hsu, C. W., Lin, S. C., Hung, Y. J., Shiu, Y. L., Hsiao, Y. C., Chang, J. Y., Tsai, D. P., Huang, T. M., ... Chen, Y. H. (2013). A method of comparing the speed of starlight and the speed of light from a terrestrial source. In The Nature of Light: What are Photons? V Article 883203 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8832). https://doi.org/10.1117/12.2023127

@inproceedings{c70ee8080b3f43c7ba4571bd800ae30d,

title = "A method of comparing the speed of starlight and the speed of light from a terrestrial source",

abstract = "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.",

keywords = "PMT, rotating mirror, speed of light, starlight",

author = "Jingshown Wu and Chang, {Shenq Tsong} and Tsao, {Hen Wai} and Huang, {Yen Ru} and Lee, {San Liang} and Chang, {Cheng Chieh} and Lin, {Wei Cheng} and Tsay, {Ho Lin} and Wang, {Yi Lung} and Huang, {Po Hsuan} and Hsu, {Ming Ying} and Hsu, {Chia Wei} and Lin, {Shu Chuan} and Hung, {Yung Jr} and Shiu, {Ye Li} and Hsiao, {Yung Chung} and Chang, {Je Yuan} and Tsai, {Din Ping} and Huang, {Ting Ming} and Young, {Hong Tsu} and Liu, {Yi Cheng} and Chang, {Chung Min} and Chiang, {Wei Chieh} and Huang, {Ji Ying} and Chen, {Ya Hsin}",

year = "2013",

month = aug,

doi = "10.1117/12.2023127",

language = "English",

isbn = "9780819496829",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

booktitle = "The Nature of Light",

note = "The Nature of Light: What are Photons? V ; Conference date: 26-08-2013 Through 29-08-2013",

}

Wu, J, Chang, ST, Tsao, HW, Huang, YR, Lee, SL, Chang, CC, Lin, WC, Tsay, HL, Wang, YL, Huang, PH, Hsu, MY, Hsu, CW, Lin, SC, Hung, YJ, Shiu, YL, Hsiao, YC, Chang, JY, Tsai, DP, Huang, TM, Young, HT, Liu, YC, Chang, CM, Chiang, WC, Huang, JY & Chen, YH 2013, A method of comparing the speed of starlight and the speed of light from a terrestrial source. in The Nature of Light: What are Photons? V., 883203, Proceedings of SPIE - The International Society for Optical Engineering, vol. 8832, The Nature of Light: What are Photons? V, San Diego, CA, United States, 26/08/13. https://doi.org/10.1117/12.2023127

A method of comparing the speed of starlight and the speed of light from a terrestrial source. / Wu, Jingshown; Chang, Shenq Tsong; Tsao, Hen Wai et al.
The Nature of Light: What are Photons? V. 2013. 883203 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8832).

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

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T1 - A method of comparing the speed of starlight and the speed of light from a terrestrial source

AU - Wu, Jingshown

AU - Chang, Shenq Tsong

AU - Tsao, Hen Wai

AU - Huang, Yen Ru

AU - Lee, San Liang

AU - Chang, Cheng Chieh

AU - Lin, Wei Cheng

AU - Tsay, Ho Lin

AU - Wang, Yi Lung

AU - Huang, Po Hsuan

AU - Hsu, Ming Ying

AU - Hsu, Chia Wei

AU - Lin, Shu Chuan

AU - Hung, Yung Jr

AU - Shiu, Ye Li

AU - Hsiao, Yung Chung

AU - Chang, Je Yuan

AU - Tsai, Din Ping

AU - Huang, Ting Ming

AU - Young, Hong Tsu

AU - Liu, Yi Cheng

AU - Chang, Chung Min

AU - Chiang, Wei Chieh

AU - Huang, Ji Ying

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AB - 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.

KW - PMT

KW - rotating mirror

KW - speed of light

KW - starlight

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AN - SCOPUS:84888376986

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ER -

A method of comparing the speed of starlight and the speed of light from a terrestrial source

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