Engraving of a figure in Cetus Engraving as part of a letter from Monsieur Sivers Mathematician of Hamburg to Henry Oldenburg, concerning his observations of a new starr in Cetus. On engraving marked 'Fig 5 observat : Stellae mirae in ceto ' At bottom of engraving, 'N3. figura haes et ex Theatre Cometico Feci observationes meas usq, ad 14 Februarii An 1667. F. Dm stanislai Lubinictzki. ' Size 142 mm high x 250 mm wide 1673