| 释义 |
he·li·om·e·ter
\ˌhēlēˈäməd.ə(r)\ noun
Etymology: French héliomètre, from hélio- heli- (I) + -mètre -meter
: a visual telescope that has a divided objective with two movable parts which give a double image and that was originally designed for measuring the apparent diameter of the sun and later used for measuring angles between stars but is now largely replaced by photographic methods |