An ephemeris is a table of where every planet actually is, minute by minute. JPL — the same lab that lands rovers — publishes the one we use, DE440.
Because the positions are real, the aspects are real. When your reading says "Mars sextile Sun, 65 degrees," that is a checkable fact of the sky, not a mood board.
It also means the same rule produces different words for different signs, different days, in your own language. The stars do not speak English; a good horoscope shouldn’t either.
You can audit us every day: the source line at the bottom of your reading names the ephemeris and the date it was computed for.