光こう行こう差さ

noun

aberration (of light)

Astronomical term for the apparent displacement of a celestial object due to the finite speed of light and the observer's motion.

• 光こう行こう差さは、地ち球きゅうの公こう転てんによって星ほしの位い置ちがずれて見みえる現げん象しょうです。

  Aberration is the phenomenon where a star's position appears to shift due to the Earth's revolution.