🔭 Equatorial Telescope Mount: Polar Alignment, Sidereal Tracking and Drift (2D)

Side view of an equatorial refractor on its polar axis next to an all-sky chart that shows the true pole, the mount axis and the target. Change the latitude, the declination, the starting hour angle, the polar axis errors in altitude and azimuth, the sidereal drive, the exposure time and the target distance, and read the altitude, the pointing error, the star trail in pixels and the drawtube extension. Coordinate round trips, the sidereal rate, the first-order drift law and the thin-lens focus are checked numerically, with four in-page numerical checks.