“My Opinion on the Lunar Canals” (1903) by H.P. Lovecraft writing when a boy. The ‘canals’ were then a current topic for debate, rather than crackpot-ery.
And his 1904 sketch observation of “The Gibbous Moon” seen through his rooftop telescope, showing the “streaks radiating from the principal craters”.
Also notable among his boy astronomer papers is a drawing of Saturn from above, looking like a staring eye and: “It can never be seen this way on the earth”.
From the Brown University Library H.P. Lovecraft Collection, with 131 items now online.