光こう跡せき

noun

light trail; trace of moving light

Refers to the visible path left by a moving light source, such as a meteor, car headlights in a long-exposure photo, or a laser pointer swept across a surface.

• 流りゅう星せいの光こう跡せきが夜よ空ぞらに一いっ瞬しゅん輝かがやいた。

  The meteor's light trail flashed across the night sky for an instant.

• 長ちょう時じ間かん露ろ光こうで撮とると、車くるまのヘッドライトが光こう跡せきになる。

  With a long exposure, car headlights turn into light trails.