the white sun

LITThe Sun is a G2V star. Its nominal effective temperature is 5772 K (IAU 2015 Resolution B3); the best estimate is 5772.0 ± 0.8 K. Seen from space it is white. It looks yellow and then orange from the ground because air scatters blue light out of the beam, more so as the path lengthens toward the horizon.

COMPUTEDThe Sun's colour is a 5772 K blackbody through CIE 1931 2°, with Rayleigh extinction τ(λ) = 0.0088·λ_µm^−4.05·airmass (a standard approximation) and the Kasten–Young airmass. It is Bradford-adapted to D65. For refraction at the horizon this page uses Bennett's formula, R = cot(h + 7.31/(h + 4.4)) arcmin, which gives about 34′ at h = 0. It is scaled per wavelength by Edlén's (n−1)(λ)/(n−1)(550). The colours' offset is the real green-flash dispersion: a few arcseconds. That answers the last critique's "real refraction" item. Nesting: an orange limb, a purple-tinged blue fringe scattered away, a green flash rim, the yellow disk, the void sky.

altitude

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