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A chat on 4chan
human
Such monuments were not uncommon in Europe and clearly show people had advanced understandings astological phenomenons before Rome came around as well. Here is another cool thing which is a 16 month sun year calendar from Austria (region back then being origin point of the celtic higher cultures such as Hallstatt culture etc).
gpt
*understanding of phenomenons
also
The rock formation is still used today to observe the equinoxes. The sun then appears exactly in the visor gap between the menhir and the rock face, according to today's date on March 21st and September 21st. If you want to take pictures of these bearings, you should get up early and position yourself on the specified date in the extension of the gap between the menhir and the calendar stone. The respective sunsets are also impressive. The calendar stone still works today with eternal precision.