The Phu Pha Kham "Gate of Time" Sakon Nakhon Thailand
A rare coincidence of astronomy and geology ...... A 100% natural cave that is aligned to equinoctial sunrise and sunset on the same day

This natural megalithic cave occured during the Mesozoic Era 250 - 65 million years ago, located on the Phupan Mountain at +360 m above the sea level in Huay Yang Village Loa Pon Kor Subdistrict, Khok Si Suphan District Sakon Nakhon Province Thailand.

Geological process during the Mesozoic Era

Location of The Phu Pha Kham "Gate of Time"

Phu Pha Kham is one of the Phupan mountain ranges

The cave is aligned to equinoctial sunrise and sunset at azimuth 90 and 270
On November 21, 2023 The Civilization Club of Sakon Nakhon went to a location on the Phupan Mountain near Huay Yang Village, Khok Si Supan District to observe the prehistoric paint that is concealed under the sandstone outcrop. After carefully observing, the two gate-like drawings were identified that represent the real megalithic gate located about 1,000 m away.
Mr Sansonthi Boonyothayan president of Civilization Club of Sakon Nakhon (right) and Ajarn Woravit Tongsiri vice-president (left) went to observed the prehistoric drawing that is concealed under the sandstone outcrop
You have to lie down in order to see the prehistoric drawing under the sandstone outcrop
Two gate-like drawings are identified
Matching the two prehistoric gate-like drawings and the real megalithic sandstone gate, east and west view

The west view looking to the east scenario

The east view looking to the west scenario
After astronomical checkup with a magnetic compass and smartphone applications, came to the conclusion that this cave is aligned precisely to the equinoctial phenomena
A magnetic compass and smarthphone applications are showing the equinoctial alignment of the cave
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The equinoctial sunrise will be here
The late afternoon sun on November 21, 2023 is one of the clues to calculate the coming equinoctial phenomena on March 21, 2024
During March 1 to April 8, sunrise and sunset will be visible through this gate
Here comes the equinoctial sunrise and sunset on March 21, 2024 and again on March 21, 2025

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Conclusion
It is hard to come across a cave that's completely natural and aligned with the equinoctial sunrise and sunset on the same day. So welcome to Sakon Nakon Thailand