La meridiana di Regiomontano

Cardboard kit for one of the most brilliant and sophisticated sundials that were ever invented: the Regiomontanus sundial measures the true local time using the sun's altitude, and indeed different than usual altitude sundials at all latitudes between Oslo and Cairo.

She was already in the 15th Century by Johannes Regiomontanus invented the famous astronomer and mathematician of Koenigsberg in Franconia.

Incidentally it also allows the determination of the rise and set times of the sun for any date and any place, and with the solder-quadrant on the back can easily be the sun's altitude (angle above the horizon distance) determined.

Complete with stand and a brass solder balls. Sturdy cardboard, noble gold print.