
Panduan
The Chikyu no Maruku Mieru Oka Observatory is located at the summit of Mt. Atago, the highest point in the Hokoso district of Choshi City, Chiba Prefecture. As its name suggests, the rooftop observation deck provides a visual experience where the horizon curves gracefully, allowing visitors to truly sense the roundness of the Earth. On clear days, the 360-degree panoramic view offers breathtaking sights, including the distant silhouettes of Mt. Fuji and Mt. Tsukuba, as well as the many wind turbines lined up along Byobugaura, often referred to as the 'White Cliffs of the Orient.' It is a place where the vastness of the Pacific Ocean meets the sculptural beauty of nature.
This hill has long watched over the history of the nearby fishing town of Sotogawa. For generations, local fishermen looked out over the sea from this vantage point, praying for bountiful catches on calm days and the safe return of their families during storms. The memory of a community that has lived in harmony with the harsh yet bounthest aspects of the ocean is deeply etched into this landscape. Today, the observatory serves as a symbol of the region and a popular destination for those wishing to experience this historical connection to the sea.

The primary attraction is the view from the rooftop observatory. Seeing the horizon not as a straight line, but as a gentle curve, is a profound experience that symbolizes the 'roundness of the Earth.' Additionally, the sight of the wind turbines standing in a rhythmic line along the coast of Byobugaura creates a unique and striking landscape. The scenery changes beautifully with the seasons and time of day, offering different emotions with every visit. On the first floor, you can find a souvenir shop featuring local specialties, while the second-floor event hall often hosts seasonal exhibitions, such as photography or painting displays.
The best time to visit depends on what you wish to experience. For a truly emotional experience, visit during twilight to see the sky and sea bathed in golden hues from the sunset. Additionally, the observatory holds special early morning hours on January 1st for the first sunrise of the year. On this day, it opens at 5:30 AM, allowing visitors to witness the spectacular new year's sunrise. Please note that since this is an early morning operation in winter, thorough preparation for the cold is essential. From spring to summer, the weather tends to be clearer, making it an ideal time to spot distant mountains like Mt. Fuji and Mt. Tsukuba.
Beyond just sightseeing, the observatory offers a chance to connect with local culture. The second-floor event hall provides opportunities to learn about local art through various exhibitions. On the first floor, browsing for local Choshi specialties is a delightful way to bring a piece of the region home. Taking a moment to relax while gazing at the vast ocean scenery provides a special sense of tranquility away from daily life.
There are many spots nearby that showcase the rich nature and history of Choshi. For instance, the Inubosaki Lighthouse is another excellent location for enjoying ocean views. You can also use a common pass with the Choshi Port Tower to visit various facilities efficiently. The area is perfect for a scenic drive, combining the lively atmosphere of fishing ports with beautiful coastal landscapes.
The rooftop area can be quite windy, so please wear appropriate clothing according to the season. Especially during the early morning of the New Year or during winter, it can be extremely cold; please prepare warm clothing and heat protection. Regarding payments, please note that for entries before 7:00 AM, only cash or PayPay are accepted. For credit cards and other electronic money, availability may vary depending on the time and situation, so it is recommended to check in advance. Please also observe facility etiquette by maintaining a quiet atmosphere to respect other visitors.