So in Star Quest the locations of the stars are determined by the seed, where the 1st two digits determine the locations of the Ruins stars, the next two digits determine the Snowdin stars, then Waterfall, Hotland, etc. Here's a spreadsheet of all the possible locations of stars and what digit they correspond to (and some other useful stuff there too): https://docs.google.com/spreadsheets/d/e/2PACX-1vSKDRarFx3VbNO-1RXVhbpB2_DHd1vNitc6DeUSDLChSvBJWNfOxZAEwOuv7yQ6abpQvlNCOehJm5fT/pubhtml