I wish people a long time, thousands of miles away. What does ChanJuan mean?

This famous poem comes from Su Shi's "Shuidiao Tou", in which "Chanjuan" refers to some beautiful things, especially the moon in this poem. The overall meaning of this sentence is that I hope that the people I miss will live a long and healthy life, and even if they are far apart, they can enjoy this beautiful moonlight together.