是日文鐘的一種, 2400~1900 BC 建造 (堯國) The slits is said to be only 1 degree in width. So it will not be possible to adjust for axial precession 歲差 if my calculation is correct the day of solstice will move 1 degree in 67 years. due to change of "obliquity of ecliptic( 黃赤交角)" the position of sun is moved by ~0.5 degree 4000 years ago. Then the slits will not should still fall in line with the solstice and equinox dates. springer kaogu sociostudies obliquity of ecliptic archaeoastronomy