The Menhir di Monte Corru Tundu is near the village of Villa Sant'Antonio, Oristano, Italy. The menhir stands at the top of the Curru Tundu hill, about two kilometers north of Villa Sant'Antonio; nearby, other menhirs can be found, including the menhir of Tuttiricchiu and the Domus de Janas, a set of prehistoric necropolises dug into the rock. The monolith is composed of grey trachytic tuff measuring 5.75 m (18.86 ft) in height; the smaller piece could be an offcut, and its peak was thought to have been shattered by lightning.
Coordinates
39.875864,8.901374
Description
There are a number of Roman towns nearby dating from the third century BC; the altitude of the location is 283 m (928.5 ft). If considering two possibilities, which are sunrise or sunset and maximum tilt, then the following is possible: using feet and sunset to give an obliquity, or feet minus maximum tilt to give a year.
(928.5 + 18.86482) / 40 = 23.68412
Or
(928.5 - 18.86482) - 1985 = 1075 AD
There is also a possibility that it is connected with the Basilica della Santissima Trinità di Saccargia, which was completed in 1116 AD. The basilica is a church and is currently tilted at an angle of 2°, with coordinates 40.671196, 8.689737. If the coordinates of the church and menhir are subtracted, the two numbers are roughly equal to 1.00. In a triangle, the perimeter is 1.83 units. 40.671196 - 39.875864 = 0.795332; 8.689737 - 8.901374 = 0.211637.
Conclusion
When using Roman feet, there is not much difference in measurement, and when using the Roman cubitum or passus, the numbers do not connect, except for the cubitum, which is nearer to 23.5° for obliquity. Using feet connects to the Basilica and thus to the ratio 1 to 1.83 for altitude; although the year is not 1116 AD, it could still mark a connection with the church for the local villagers.
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