It could be the fifth of the seven sisters by brightness, number of stars, number of planets, alphabetically or by mythological age. I can't think of another way of ranking the seven sisters.
Lil wiki quote about Thursday:
The name is derived from Old English Þūnresdæg and Middle English Thuresday (with loss of -n-, first in northern dialects, from influence of Old Norse Þorsdagr) meaning "Thor's Day".[URL="https://en.wikipedia.org/wiki/Thursday#cite_note-1"][1][/URL][URL="https://en.wikipedia.org/wiki/Thursday#cite_note-2"][2][/URL][URL="https://en.wikipedia.org/wiki/Thursday#cite_note-3"][3][/URL] Thunor, Donar (German, Donnerstag) and Thor are derived from the name of the Germanic god of thunder, Thunraz, equivalent to Jupiter in the interpretatio romana.
So might point toward actual Jupiter in Sol (if this message isn't related to barnacles - which might very well be the case)
Or might point towards gas giant of Jupiter type in Pleiades somewhere
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