B-52爆撃機のスタートラッカー内蔵の電気機械式角度計算機
GPS以前の時代、B-52爆撃機は天体航法のためにスタートラッカーを搭載していた。このシステムは、電気機械式アナログコンピューター「角度計算機」を使用して三角関数計算を行い、星の位置から航法情報を自動的に算出していた。1960年代初頭に開発されたこの装置は、デジタルコンピューターが適さなかった当時、複雑な機械機構で天球を物理的にモデル化していた。
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