TIL that in "aurora australis" both words come from the same PIE root meaning "dawn" [1]. After an hour down this rabbit hole I now also know that English "east

TIL that in "aurora australis" both words come from the same PIE root meaning "dawn" [1]. After an hour down this rabbit hole I now also know that English "east" is related to the latin "auster" ("south") [2] through the same root. Then the words "aurum" [3] and "air" [4][5] seem to fall into the same bucket too, as long as you can trust the linguistics and the quality of wiktionary texts. These two lists of derived terms are fascinating: [6][7]. [1] https://en.m.wiktionary.org/wiki/aurora_australis#Latin https://en.m.wiktionary.org/wiki/aurora_australis#Latin [2] https://en.m.wiktionary.org/wiki/auster#Latin https://en.m.wiktionary.org/wiki/auster#Latin [3] https://en.m.wiktionary.org/wiki/aurum#Latin https://en.m.wiktionary.org/wiki/aurum#Latin [4] https://en.m.wiktionary.org/wiki/air https://en.m.wiktionary.org/wiki/air [5] https://en.m.wiktionary.org/wiki/%E1%BC%80%CE%AE%CF%81#Ancient_Greek https://en.m.wiktionary.org/wiki/%E1%BC%80%CE%AE%CF%81#Ancie... [6] https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/h%E2%82%82ews- https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Indo-E... [7] https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/h%E2%82%82ews%C3%A9r https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Indo-E...