Thailand goes shadowless: Sun overhead phenomenon begins
Get ready to look up because Thailand is about to go shadowless. The rare and dazzling astronomical event known as the sun overhead phenomenon is sweeping across the country, starting today in Yala’s Betong district and continuing through to May 22 in Chiang Rai’s Mae Sai district.
The National Astronomical Research Institute of Thailand (NARIT) confirmed that this solar spectacle will be visible in all 77 provinces as the sun passes directly overhead, causing objects to cast no shadows for a brief moment. Thanks to Thailand’s tropical location, positioned between 5 to 20 degrees north latitude, the country gets treated to this twice a year.
NARIT explains that while the direct sunlight may slightly raise surface temperatures, the overall climate impact is minimal. Factors such as seasonal monsoons, rainfall, and heat accumulation play a more significant role in temperature variations.
The first round of this phenomenon begins today, April 4, in Betong, Yala, precisely at 12.19pm. From there, the sun will move northward, making its way across provinces until concluding in Mae Sai, Chiang Rai, at 12.17pm on May 22. The second round will begin in late July and end in early September, with the sun tracing its way back down the country.
Some highlight dates for the first occurrence include:
- Bangkok: April 27 at 12.15pm
- Chon Buri: April 25 at 12.14pm
- Ubon Ratchathani: May 1 at 11.58am
- Chiang Mai (Princess Sirindhorn AstroPark): May 15 at 12.21pm
And for the second phenomenon:
- Bangkok: August 16 at 12.22pm
- Phuket: September 2 at 12.26pm
- Songkhla: September 4 at 12.17pm
- Betong, Yala: September 7 at 12.14pm
Tourists, science lovers, and skywatchers are encouraged to experience this unique moment when nature defies shadows. It’s not only an excellent opportunity for science education but also a great excuse to head outdoors—just don’t forget your sunscreen!
For a complete list of provinces and exact times, visit NARIT’s official site.
This twice-yearly event is a reminder that sometimes, the most fascinating shows are playing out right above our heads.
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