arding then took the instrument which he had made the evening before， the space between its two legs giving the angular distance between the star alpha and the horizon. he measured， very exactly， the opening of this angle on a circumference which he divided into 360 equal parts. now， this angle by adding to it the twenty-seven degrees which separated alpha from the antarctic pole， and by reducing to the level of the sea the height of the cliff on which the observation had been made， was found to
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