| 单词 |
backsight |
| 释义 |
backsight
backsight (ˈbækˌsaɪt) n1. (Shooting) the sight of a rifle nearer the stock2. (Surveying) surveying a reading taken looking backwards to a previously occupied station. Compare foresight4backsight
backsight[′bak‚sīt] (engineering) A sight on a previously established survey point or line. Reading a leveling rod in its unchanged position after moving the leveling instrument to a different location. (navigation) A marine sextant observation of a celestial body made by facing 180° from the azimuth of the body and using the visible horizon in the direction in which the observer is facing. backsightIn surveying, a sight on a previously established survey point or line. |
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