Letter, from Johannes Hevelius to Henry Oldenburg, dated at Danzig (Gdansk) Still believes that stellar distances cannot be determined using a small instrument even if it has 'telescopic sights'; proposes a challenge to Robert Hooke in relation to this problem; concerning the telescope which the Royal Society sent him; concerning the lenses of Titus Livius Burattini (1617-1683); concerning a certain friend's invention of a clockwork equatorial sundial Read to the Royal Society on 17 December 1668 Postscript to letter has observations of the solar eclipse on 4 November at Danzig with table (figure for solar eclipse found at LBO/2/336) On reverse is the account of the clockwork equatorial sundial with figure in margin Read to the Royal Society on 7 January 1669 1668