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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. The term is an extension of the Belchen triangle. The mountains are:
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The heart of the Belchen system is the southernmost mountain of the Vosges, the Ballon d'Alsace (Elsässer Belchen or Alsatian Belchen, 1,247 metres). 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. Conversely, the sun sets over the Alsatian Belchen on these days when seen from the Black Forest Belchen.
Viewed from the Alsatian Belchen at the time of the summer solstice, the sun rises over Petit Ballon (Kleiner Belchen or Little Belchen, 1,272 metres), 27 kilometres away to the northeast. 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.
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