The Letter of Petrus Peregrinus on the Magnet, A.D. 1269 — PART II CHAPTER I THE CONSTRUCTION OF AN INSTRUMENT FOR MEASURING THE AZIMUTH OF THE SUN THE MOON OR ANY STAR ON THE HOR

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The Letter of Petrus Peregrinus on the Magnet, A.D. 1269 PART II CHAPTER I THE CONSTRUCTION OF AN INSTRUMENT FOR MEASURING THE AZIMUTH OF THE SUN THE MOON OR ANY STAR ON THE HOR · ch 13/19

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