Observations of asteroid occultations by the trailed-image method

弦 (天文學)

在天文學的領域中，術語弦（）通常是指在掩星事件中掠過天體的線. 通過精確測量事件開始和結束的時間，結合觀測者已知位置和天體的軌道，可以確定弦的長度，從而得知掩星天體的大小.

Chord (astronomy)

In the field of astronomy the term chord typically refers to a line crossing an object which is formed during an occultation event.