A constellation was a group of stars.
Clara Clayton was very interested in astronomy, and often used her telescope to look at the stars, as she had done as a child while quarantined for three months with diphtheria, as well as the Moon.
Clara appeared to know where a lot of the constellations were, as she was able to give Emmett Brown a lunar geography lesson while they looked at the Moon and the stars through her telescope on September 5, 1885.
Appearances
- Back to the Future Part III (Mentioned only)