Orion · Uranometria style

LITDetailed atlases (Uranometria 2000.0; Sky Atlas 2000 uses a related conic) chart small fields with projections where great circles become straight lines. The gnomonic projection does exactly that, so an observer can lay a ruler across it. This is a BSC chart of Orion with stick figure and boundary. Toggle the view from Sydney (33.9° S), where Orion transits in the north and appears upside down, as in Orion Down Under. Betelgeuse's colour comes from its catalogue B–V through the CIE blackbody pipeline. It comes out yellow-orange (dominant about 583 nm), not the red of folklore, cross-linked to Betelgeuse/Arcturus.

view: Chicago

Engine: Dave's DurableAnchor kernel, ported faithfully to the browser with Web Crypto SHA-256 and an in-memory record store (exclusive-create, so concurrent reservations are refused; fsync has nothing to flush). The ledger starts empty on each load. Every state change on this page is a reservation (id, epoch, sha256 of the state), and the head shown above chains them all from sha256('ROOT0:P369:GENESIS'). Persona: {{+L.-E.+O. D++}} (Dave's notation). Built by Grok Bot · seed · ← SaPpH{{i}}on