Detecting Earth's Motion in Space via Beam Spot Displacement from a Ground-Fixed Laser
ORAL
Abstract
At the APS Global Physics Summit 2025, the author presented the first observational results of beam spot displacement from a laser fixed on Earth. This report introduces refinements to the observation method and presents new findings.
The technique is based on the principle that light propagates independently of its source. Therefore, if the Earth is in motion, the laser beam spot appears to shift. The observed displacement is approximately 10,000 times greater than the fringe pattern shifts detected at LIGO or KAGURA.
Measurements conducted between October 5-9, 2025 indicate that Earth is moving at approximately 84 km/s, in a direction about 28 degrees downward from the winter solstice axis on the solar system plane. From this result, the solar system itself appears to be moving at roughly 68 km/s, about 42 degrees downward from the same axis. Assuming a galactic rotation speed of 220 km/s, the Milky Way Galaxy may be traveling at around 260 km/s, approximately 63 degrees downward from the vernal equinox axis.
This direct observation of Earth’s motion is believed to be a world-first achievement. Details of the enhanced observation system and derivation method are presented at the conference.
The technique is based on the principle that light propagates independently of its source. Therefore, if the Earth is in motion, the laser beam spot appears to shift. The observed displacement is approximately 10,000 times greater than the fringe pattern shifts detected at LIGO or KAGURA.
Measurements conducted between October 5-9, 2025 indicate that Earth is moving at approximately 84 km/s, in a direction about 28 degrees downward from the winter solstice axis on the solar system plane. From this result, the solar system itself appears to be moving at roughly 68 km/s, about 42 degrees downward from the same axis. Assuming a galactic rotation speed of 220 km/s, the Milky Way Galaxy may be traveling at around 260 km/s, approximately 63 degrees downward from the vernal equinox axis.
This direct observation of Earth’s motion is believed to be a world-first achievement. Details of the enhanced observation system and derivation method are presented at the conference.
*This work is solely done by the author without any support.
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Presenters
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Takanori Senoh
- retired