Astrolabe made by or belonging to Zacharias Jansen, , 1600 - 1636 Canvas Print
Instrument of various metals for degree measurement formed like a large flat round watch. With inscription 'ZACHARIAS JANSEN MIDELBURG ANNO 1636'. Limbus: division into 2 x 1-12 hours and 0-90-0-90 degrees. Index without degree format. Rete: Ecliptic with the names and signs of the zodiac. Inside, with name and sign, 15 fixed stars and outside of that 20 fixed strren. Tympanon: two discs for pole heights 49 and 52 degrees, 46 and 55 degrees. North-south meridian, horizon rectus, tropic of cancer, equator, tropic of capricorn, horizon obliquus, height parallels, azimuth lines, dawn line, twilight line, lines of the twelve houses (I-XII), lines of the 1-12 hours. Mater: inscription. Dorsum: Edge showing the names of the zodiac, months and days and scale 90-0-90-0 degrees. Top half: 1-12 hours. Bottom half: shadow quadrant. Alhidade without degree classification.
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