Editing Astronomical clock (section)

=== The Rasmus Sørnes Clock ===
[[File:RasmusSornesClock.jpg|thumb|upright=1.1|The [[Rasmus Sørnes]] Clock.]]

Arguably the most complicated of its kind ever constructed, the last of a total of four astronomical clocks designed and made by Norwegian [[Rasmus Sørnes]] (1893–1967), is characterized by its superior complexity compactly housed in a casing with the modest measurements of 0.70 x 0.60 x 2.10 m. Features include locations of the sun and moon in the zodiac, [[Julian calendar]], [[Gregorian calendar]], [[sidereal time]], GMT, local time with daylight saving time and leap year, solar and lunar cycle corrections, eclipses, local sunset and sunrise, moon phase, tides, [[sunspot]] cycles and a [[planetarium]] including [[Pluto]]'s 248-year orbit and the 25 800-year periods of the polar ecliptics ([[precession]] of the Earth's axis). All wheels are in brass and gold-plated. Dials are silver-plated. The clock has an electromechanical pendulum.

Sørnes also made the necessary tools and based his work on his own astronomical observations. Having been exhibited at the Time Museum in Rockford, Illinois (since closed), and at the [[Chicago Museum of Science and Industry]], the clock was sold in 2002 and its current location is not known. The Rasmus Sørnes Astronomical Clock No. 3, the precursor to the Chicago Clock, his tools, patents, drawings, telescope, and other items, are exhibited at the [[Borgarsyssel Museum]] in [[Sarpsborg]], Norway.