October 22. 2021: Speedy Mercury is low in the east before sunrise. It is putting on its best morning performance of the year. Arcturus, in the east-northeast, is about the same altitude as Mercury.
This episode is also available as a blog post: https://whenthecurveslineup.com/2021/10/15/2021-october-22-mercurys-morning-best-arcturus/