Labels:door | earth | fence | grass | person | reckoner | road | sky | stairs OCR: Halley comet Comet named after the English astrona mer Edmond Halley wha demonstrated through ma the matical calculations thatit was possible ta predict the cyc- lical retum af these astronomical objects When ir 1682, comet rea appeared Europe as he had predicted was named Halley after its chronicler rather thar its identifier Halleys that return cormet reappeared over than