Light difference

Japanese: 光差 - こうさ
Light difference
The difference between the actual time when a phenomenon occurs on a celestial body and the time when that phenomenon is observed on Earth. It is expressed as the time it takes for light emitted from a celestial body to reach Earth. It can also refer specifically to the time it takes for light to travel a distance of one astronomical unit.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 ある天体に一つの現象が起こった実際の時刻と、その現象を地球上で観察する時刻との差。ある天体から発した光が地球に達するのに要する時間で表わす。特に光が一天文単位の距離を進むのに要する時間をいう場合もある。

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