I was having a look at the official constellations, and I noticed three with similar names:
- Corona Australis
- Piscis Austrinus
- Triangulum Australe
Now the "Austral" definitely means "southern", as these constellations are otherwise known as the Southern Crown, Southern Fish, and Southern Triangle, respectively. (Also the origin of the name "Australia".) Predictably, they're also all in the southern celestial hemisphere as well. My question is - if they're all the same word, presumably of Latin origin, then why are they spelled in three different ways? I'd assume some sort of different noun-forms, which Latin is notorious for, but since they're all used in the same context, you'd think they'd be in the same declension. Anyone know why these names (and specifically these forms of the word) were chosen for these constellations?