Polar Telescope
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An astronomical telescope used to determine the precession, nutation, and aberration constants of the Earth's axis. It takes intermittent photographs of a faint star of about magnitude 10 within 1° of the North Pole (the plate is rotated in accordance with the diurnal motion during exposure), and from these the apparent position on the celestial sphere of the direction of the Earth's axis of rotation is measured. Source : Heibonsha Encyclopedia About MyPedia Information |
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地球の自転軸の歳差，章動，光行差定数を決定するために用いられる天体写真望遠鏡。北極から１°以内にある10等級程度の微光星を間欠的に撮影（露光中は乾板を日周運動に合わせて回転させる）し，これから地球の自転軸の方向の天球における見かけの位置を測定して求める。
出典 株式会社平凡社百科事典マイペディアについて 情報 |
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