In 1721, the Qing dynasty began to send eclipse documents to Joseon, which influenced the astronomy of Joseon Gwansanggam. The Qing documents contained predictions of solar and lunar eclipses in Seoul. This papers argues that the Qing eclipse documents became a new criterion for evaluating the accuracy of the eclipse calculations carried out by Joseon astronomers, and such changes affected the overall reform and improvement of their solar and lunar eclipse calculation skills. They had to calculate not only calendars but also solar and lunar eclipses based on documents provided by the Qing dynasty. This imperative, this article suggests, urged the Joseon government to dispatch official astronomers to Beijing every year from 1741. Learning how to calculate solar and lunar eclipses from Qing astronomers became the most urgent goal for Joseon astronomers during the 1740s and 1750s. By the early 1750s, they were able to produce the same results as the Qing documents.