Letter, from Johannes Hevelius to Henry Oldenburg, dated at Danzig (Gdansk) States that a more detailed account of the comet is being sent; wishes to know about the new way of making telescopes in England; that he has obtained the lenses for his 140-foot telescope; that he has not seen the report about the phases of Saturn from the Parisian astronomers; asks that John Flamsteed continue with his predictions of the appulses of the moon to planets and fixed stars because he believes that these provide a more accurate method to observe differences in longitude Read to the Royal Society on 19 June 1672 10 June 1672