vers
vers — 縮寫
1. a short written form of 'versed sine' — a mathematical function equal to 1 minus
正矢
歷史三角函數，1減去角的餘弦
a short written form of 'versed sine' — a mathematical function equal to 1 minus the cosine of an angle, formerly used in navigation and astronomy before electronic calculators became common.
Zola used a vers table to find the position of her ship at sea.
Zola 利用正矢表在海上定位她的船。
collocation: vers table / versine table
The vers of a 30-degree angle equals 1 minus the cosine of 30 degrees.
30 度角的正矢等於 1 減去 30 度的餘弦。
grammar pattern: vers of [angle]
Before computers, navigators calculated vers values by hand using printed logarithm books.
在電腦出現之前，航海者用手算對數書來計算正矢值。
An old astronomy textbook listed vers for every degree from zero to one hundred eighty.
一本老舊的天文學教科書列出了從零度到一百八十度每個角度的正矢。
The math teacher explained that vers equals one minus the cosine of the angle.
數學老師解釋說，正矢等於 1 減去角的餘弦。
- versed sine
the full name that vers abbreviates; identical in meaning but formal
用法筆記
Rarely used today — replaced by the cosine function in modern mathematics. Appears mainly in historical texts on navigation, astronomy, and the history of mathematics.