“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.

Washington, D.C. (a city, the capital city of the United States)

(astronomy) Cygnus

Alternative spelling of おひつじ座 (“Aries”) (constellation)

(astronomy) Apus

Alternative spelling of おおいぬ座 (“Canis Major”)

Gemini (constellation)

Alternative spelling of 蛇遣座 (“Ophiuchus”) (constellation)

Alternative spelling of へびつかい座 (“Ophiuchus”)