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航海三角形

航海三角形. CELESTIAL TRIANGLE. 第一節　航海三角形的成立. 航海三角形與大圓航法. 觀測者緯度與天體赤緯同名. 觀測者緯度與天體赤緯異名. 第二節　三角形的三邊. 極距 (polar distance) 或稱餘赤緯 (co-Dec) 同名 (same name) p.d.=90-Dec 異名 (contrary name) p.d.=90+Dec. 極距 (polar distance). EX1 觀測者在 L25-09N, λ 121-46E, 天體之 Dec 20-18N, 求 p.d. 同名 (same name)

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航海三角形

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  1. 航海三角形 CELESTIAL TRIANGLE

  2. 第一節　航海三角形的成立

  3. 航海三角形與大圓航法

  4. 觀測者緯度與天體赤緯同名

  5. 觀測者緯度與天體赤緯異名

  6. 第二節　三角形的三邊 • 極距(polar distance)或稱餘赤緯(co-Dec) • 同名(same name)p.d.=90-Dec • 異名(contrary name)p.d.=90+Dec

  7. 極距(polar distance) • EX1 觀測者在 L25-09N,λ121-46E, 天體之Dec 20-18N, 求p.d. 同名(same name) 90 - )20-18 p.d. 69-42 • EX2 觀測者在 L25-09N,λ121-46E, 天體之Dec 20-18S, 求p.d. 異名(contrary name) 90 + )20-18 p.d. 110-18

  8. 餘緯(co-latitude) • 近極(near pole) ：觀測者在北半球，選北極為近極。觀測者在南半球，選南極為近極。

  9. 六分儀測天體高度

  10. 餘高(co-altitude)天頂距(zenith distance) • H：高度 • h：六分儀高度 • co-alt.=90-H • EX： 觀測者在 L25-09N,λ121-46E, 天體之高度為40-21.0, 求co-lat, co-alt 90 90 - )25-09.0 -) 40-21.0 co-lat. 64-51.0 z.d. 49-39.0

  11. 航海三角形的內角

  12. 子午角(meridian angle；t) • LHA<180；tw=LHAEx: LHA=150，find t ? t=150w • LHA>180；tE=360-LHAEx: LHA=2600，find t ? t = 3600-2600 =1000E

  13. 方位角(azimuth angle；Az) • 方位角：觀測者子午線與天體垂直圈的較小夾角。 • 方位角前冠觀測者緯度名(N or S)，後冠子午角方向名(E or W)。

  14. 方位角(Az)換算成真方位(Zn)

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