# 方位角

## 導航

### 真北方位角

 正北 0° 正南 180° 北北東 22.5° 南南西 202.5° 東北 45° 西南 225° 東北東 67.5° 西南西 247.5° 正東 90° 正西 270° 東南東 112.5° 西北西 292.5° 東南 135° 西北 315° 南南東 157.5° 北北西 337.5°

## 地圖方位角

${\displaystyle \alpha ={\frac {180}{\pi }}\operatorname {atan2} (X_{2}-X_{1},Y_{2}-Y_{1})}$

${\displaystyle \alpha =\operatorname {atan2} (X_{2}-X_{1},Y_{2}-Y_{1})}$

### 計算座標

{\displaystyle {\begin{aligned}X_{2}&=X_{1}+D\sin \alpha \\Y_{2}&=Y_{1}+D\cos \alpha \end{aligned}}}

## 參考文獻

1. ^ https://terms.naer.edu.tw/detail/074faaf3e2937654ed6ceb5d82c1baa1/?seq=2
2. ^ 存档副本. [2023-05-25]. （原始内容存档于2023-05-25）.
3. ^ 存档副本. [2023-05-25]. （原始内容存档于2023-05-25）.
4. ^ Azimuth. Dictionary.com. [2020-12-05]. （原始内容存档于2016-03-04）.
5. ^ U.S. Army, Map Reading and Land Navigation, FM 21–26, Headquarters, Dept. of the Army, Washington, D.C. (7 May 1993), ch. 6, p. 2
6. ^ U.S. Army, Map Reading and Land Navigation, FM 21–26, Headquarters, Dept. of the Army, Washington, D.C. (28 March 1956), ch. 3, p. 63
7. ^ U.S. Army, ch. 6 p. 2
8. ^ U.S. Army, Advanced Map and Aerial Photograph Reading, Headquarters, War Department, Washington, D.C. (17 September 1941), pp. 24–25
9. ^ U.S. Army, Advanced Map and Aerial Photograph Reading, Headquarters, War Department, Washington, D.C. (23 December 1944), p. 15