We reconstruct sky configurations for moments of scientific significance. Every chart is computed using the same ephemeris methodology we apply to contemporary observations: verifiable, reproducible, open.
The night Galileo first observed four points of light arranged near Jupiter: the Galilean moons. We reconstruct the visible sky from his observatory at 22:00 local time, with each moon's apparent offset computed to arcsecond precision.
The solar eclipse that confirmed Einstein's general relativity. We reconstruct the totality path, the deflected starlight positions Eddington measured, and the local sky during the 6-minute totality.
The redshift measurements that established the universe is expanding. We reconstruct the spectral observations of distant galaxies that turned a static cosmos into a dynamic one, and gave us the first quantitative scale of the Milky Way's place in the universe.
SN 1604, the last supernova observed in the Milky Way with the naked eye. Kepler tracked its brightness for eighteen months, work that helped overturn the doctrine of an unchanging heavens. We reconstruct its apparent magnitude curve and sky position.
“If you wish to make an apple pie from scratch, you must first invent the universe.”
Carl Sagan