By 1640, Gascoigne had developed a reticle and a micrometer for his telescope, both of which would have been invaluable to Horrocks.
Horrocks produced several drafts of a Latin treatise Venus in sole visa (Venus seen on the Sun) based on his observations, which he presumably intended to publish, but he died suddenly from unknown causes on 3 January 1641, aged 22 [REF].