Yeesh · Life — One Door
One sky, three exact ways to flatten it. The same celestial sphere becomes a little planet (stereographic), a globe seen from outside (orthographic), or the all-sky dome (equidistant) — the only thing that changes is how the angle of a point above the horizon maps to a radius on the disk. Flip the view from zenith to nadir and watch the sky turn inside out; the real Sun, Moon, pole stars, and zodiac update for any date, time, and latitude you set.
It opens with a free account — along with the full book One Father and every other app in the suite.
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