6. Kunci Osk Astronomi Sma 2019

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  • Words: 114
  • Pages: 9
• Segitiga bola antara bintang Vega, kutub langit, dan bintang Altair.

[Nilai : 2] • Formula cosinus

cos S “ cosp90 ´ δV ega q cosp90 ´ δAltair q ` sinp90 ´ δV ega q sinp90 ´ δAltair q cospRAAltair ´ RAV ega q [Nilai : 5] atau

cos S “ sinpδV ega q sinpδAltair q ` cospδV ega q cospδAltair q cospRAAltair ´ RAV ega q “ 0,8271 [Nilai : 1]

S “ cos´1 p0,8271q “ 34˝ [Nilai : 2] Jarak sudut antara Vega dan Altair adalah 34 ˘ 1 derajat. Catatan: Rentang sudut yang diperbolehkan adalah 34 ˘ 1˝ . [Total nilai : 16]

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