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Central Square Window (Interior Entrance)
The central square window of Cheomseongdae is an opening of roughly 1 m² positioned about 4.16 metres up from the base, facing slightly south. It serves as the only entrance to the tower's interior. The structure is completely filled with earth and rubble from ground level to the window's level, making it impossible to access the interior from below. Visitors can see what to see from outside only.
Upper Platform with Jeongja-seok
The upper platform of Cheomseongdae is crowned by two rows of stones arranged in the shape of the Chinese character 井 (jeong), known as Jeongja-seok. This element forms the functional apex of the tower and is believed to have housed an astronomical observation instrument. What to see here includes the carefully positioned stonework that likely supported celestial measurement equipment during the Silla period.
Square Base (Stylobate) of 12 Stones
Cheomseongdae's square stone base comprises a single layer of twelve large rectangular granite blocks, upon which the tower's cylindrical shaft rises. The base dimensions vary slightly between sources, ranging from 5.35 to 5.7 metres per side. What to see here is the precise engineering of this 7th-century foundation, which has supported the observatory's distinctive form for over 1,300 years.
- 1.Central Square Window (Interior Entrance)
- 2.Upper Platform with Jeongja-seok
- 3.Square Base (Stylobate) of 12 Stones
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