EN
The correspondence with Stanisław Lubieniecki (1623–1675) is the fourth most voluminous in the corpus of letters of Johannes Hevelius (1611–1687) – there are over ninety letters they wrote to each other between 1664 and 1673. Their positions in the learned world, however, were very unequal. Hevelius was a reputed astronomer and a fellow of the Royal Society, while Lubieniecki was an amateur interested in comets and astronomy. In this paper, I present the goals they have in this correspondence and the ways in which they tried to achieve them, and I try to explain why their correspondence was so numerous and long-lasting.