Drawing, Comet observation by Robert Hooke Robert Hooke's observations of a comet, both with a telescope and with the naked eye. Drawing (in pencil) shows the comet's position and appearance flying through the sky with a tail behind it. Annotations read: [In pencil] 'Telescope inverted / d [delta] bayeri Pegasi; small star' [In ink] 'To the naked eye' Subject: Astronomy 5 January 1681