The Observatory in Commemoration of the 7th Cycle Birthday Anniversary of His Majesty the King, under the National Astronomical Research Institute of Thailand (NARIT), was established as a central hub for astronomical learning for the public in the eastern region. Officially opened in February 2018, it occupies approximately 36 rai of land donated by Wat Wang Yen temple. The observatory is designed to be an educational center, a science tourism destination, and a center for astronomical activities for youth, teachers, students, and the general public. It is the second regional public observatory in Thailand, after Nakhon Ratchasima, and a key member of the country's regional observatory network.

The main building comprises a digital full-dome planetarium, an astronomy exhibition building, and the observatory itself with an outdoor observation area. All sections are interconnected under the concept of "learning through real-world experiences." The planetarium utilizes a high-resolution digital projection system capable of realistically simulating the sky, stars, galaxies, nebulae, and various astronomical phenomena. Visitors can learn about the movement of stars and the changing seasons. Experience solar and lunar eclipses and space exploration through immersive astronomical films projected onto a large dome, making viewers feel like they're truly floating in space.

Inside the exhibition building, astronomical knowledge is presented in interactive exhibition formats, allowing visitors to experiment, play, and learn independently. Topics include the solar system, planets, star formation, black holes, space technology, telescopes, cosmic exploration, as well as knowledge about time, calendars, and daily sky observation. Many sections are designed to be suitable for children and youth learning, and also serve as outdoor science classrooms for schools in the eastern region. There are also outdoor exhibitions such as a solar system model, sundial, and science activity areas that make learning astronomy easier to understand and more accessible.

Another highlight is the domed observatory building, which houses a large reflecting telescope specifically for observing celestial objects, as well as an open-air stargazing area for nighttime astronomical observations. Inside the dome, there is an automatic retractable roof system and astronomical equipment capable of studying planets, moons, binary stars, star clusters, and distant celestial objects. On clear nights, visitors can clearly see details of the moon's surface, Saturn's rings, or Jupiter's moons through the observatory's telescopes.

The most popular activity here is "Narit Public Night," held every Saturday from 6:00 PM to 10:00 PM. This event offers the public the opportunity to observe celestial objects through telescopes free of charge. Astronomers and staff are usually present to explain planets, stars, meteor showers, or other astronomical phenomena occurring at different times of the day, providing visitors with both knowledge and a hands-on experience. Many participants have stated that seeing Saturn or the Moon through a large telescope is an impressive and inspiring experience that has sparked their interest in science.

Beyond its roles as a tourist attraction and educational center for the general public, the observatory plays a crucial role in promoting science in Thailand. It supports teacher training, astronomy camps, youth workshops, and educational programs in the region. Its connections to the research and astronomical activities network of Narit, Thailand's leading astronomical organization, make the Chachoengsao Observatory more than just a tourist destination; it's a center for modern science learning that inspires the next generation and is one of the most prominent academic tourism destinations in Chachoengsao province.

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How to Get There

• From Chachoengsao city center, take Highway 304 (Chachoengsao-Kabin Buri) towards Plaeng Yao. At the Phanom Sarakham interchange, follow the signs for Plaeng Yao District. The observatory is located near the Plaeng Yao Government Center with clear directional signs along the way.

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Travel Tips

• Check the planetarium show schedule before visiting.

• Saturday evenings are the best time for stargazing activities.

• Clear skies after rain usually provide better visibility.

• Arrive at least 15–20 minutes before each showtime.

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Admission Fees:

• Astronomy Exhibition: Free Entry

• Planetarium Show: Students 30 THB / Adults 50 THB

Opening Hours:

• Tuesday – Sunday: 9:00 AM – 4:00 PM

• (Exhibition on Saturdays is open until 5:00 PM)