ell ation ▁Sc or pi us . ▁ ▁F om al h aut ▁( Alpha ▁P is cis ) ▁winter ▁sol st ice ▁is ▁the ▁bright est ▁star ▁in ▁the ▁const ell ation ▁P is cis ▁Aust r inus . ▁ ▁To ▁medieval ▁ast ro log ers , ▁Al de bar an ▁was ▁one ▁of ▁fifteen ▁Be hen ian ▁stars , ▁associated ▁with ▁rub ies , ▁milk ▁th ist les ▁and ▁the ▁k ab bal istic ▁sign ▁. ▁ ▁In ▁H indu ▁ast ro log y , ▁Al de bar an ▁corresponds ▁to ▁the ▁R oh ini ▁Nak sh atra . ▁ ▁In ▁Western ▁Sid ere al ▁Ast ro log y , ▁computation ▁is ▁based ▁on ▁defining ▁Al de bar an ▁as ▁ 1 5 ▁degrees ▁T aur us ▁precisely .< Cy ril ▁F agan >< G arth ▁Allen > ▁ ▁Alg ol ▁In ▁ast ro log y , ▁Alg ol ▁is ▁one ▁of ▁the ▁most ▁un fortun ate ▁stars . ▁P to le my ▁referred ▁to ▁it ▁as ▁" the ▁G org on ▁of ▁Per se us " ▁and ▁associated ▁it ▁with ▁death ▁by ▁dec ap itation : ▁mirror ing ▁the ▁myth ▁of ▁the ▁hero ▁Per se us ’ ▁victory ▁over ▁the ▁s nake - head ed ▁G org on ▁Med usa . ▁Histor ically , ▁it ▁has ▁received ▁a ▁strong ▁association ▁with ▁violence ▁across ▁a ▁wide ▁variety ▁of ▁cult ures . ▁Med ieval ▁Arab ic ▁command ers ▁tried ▁to ▁ensure ▁that ▁no ▁important ▁battle ▁began ▁whilst ▁the ▁light ▁of ▁Alg ol