Ground Truth · live sky · every position recomputed in your browser
The Sky Above You
Name any place on Earth and look up. The Sun, the Moon and the five
naked-eye planets in the sky over that place — right now, or at any moment you choose — every
position recomputed live from the canonical astronomical algorithms.
Nothing is fetched, nothing is generated; the formulas all sit in one file beside this page,
and they were checked against JPL Horizons before it shipped.
Name a place, or pick one below.
Scrub through the next 24 hours
+0h
−12hnow+12h+24h
you · looking up
—
illumination — · phase angle —
elongation from Sun —
distance to Earth —
Lift the hood — the numbers underneath
the sky remembers who looked · the collective map
Anyone who looks up from a place can leave a mark — a wordless,
nameless record that someone looked up here. This map is every mark ever left, on this
page and on the sibling ground page, drawn live
from the shared archive. A mark stores a 0.1° cell, a kind, and a count — nothing else, and
nothing about you.
looked up at the skydrilled the ground
reading the archive…
stores the 0.1° cell (~11 km), the kind, a count — no name, no exact point, no trace of you