Belchen system

The Belchen system comprises five mountains with the name Belchen around the tripoint of Germany, France, and Switzerland that may[weasel words] have been used by the Celts as a solar calendar.

Seventy three kilometres due east is the Black Forest Belchen (Schwarzwälder Belchen, 1,414 metres), which is only 167 metres higher and over which the sun rises at the equinoxes, i.e. at the beginning of spring and autumn, as seen from Grand Ballon.

At the winter solstice it rises over the Belchenflue (Schweizer Belchen or Swiss Belchen, 1,099 metres), 88 kilometres to the southeast.

Thus from the Alsatian Belchen the start of all four astronomical seasons is defined.

The region of the Belchen system is known today as the Upper Rhine, the Regio Basiliensis, the Dreiland or RegioTriRhena.