“Lovecraft and the Stars” by E. Hoffmann Price, in The Arkham Sampler #6, Spring 1949. In which Price indulges in some humorous astrological flummery and boondoggling as he makes up notes for Lovecraft’s astrological birth-chart. But he also slides in quite a few biographical angles, from one who had known Lovecraft in person and by correspondence.
According to Joshi’s Bibliography, it was never reprinted.
Amateur Correspondent, May-June 1937 has E. Hoffmann Price’s “The Sage of College Street”, not reprinted in Lovecraft Remembered but now collected in the new Ave atque Vale.