Heliostat

Japanese: ヘリオスタット
Heliostat
A device in which a polar axis supporting a single plane mirror rotates once a day in accordance with the diurnal motion of the sun, sending the light in a fixed direction. Its structure is simpler than that of a coelostat, but its disadvantage is that the image of the sun rotates over time.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
1枚の平面鏡を支えた極軸が太陽の日周運動を追って1日1回転の速さで回転し,その光を一定方向に送る装置。シーロスタットより構造は簡単だが,太陽像が時間とともに回転するのが欠点。

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