There is a clear local highlight to consider when choosing a stay in Sonnen: the Solar System Walking Trail. It combines a walking route with a depiction of the Sun and planets at a scale of 1:1 billion. This draws attention both to a specific activity and to the proportions of the Solar System. Anyone interested in astronomy can get to know Sonnen through this theme.
The Solar System Walking Trail
The starting point is by the town hall next to the church in Sonnen, where the Sun model stands. The trail is 6.8 km long and ends at the model of the dwarf planet Pluto by the observation tower in Oberfrauenwald. From there, you can look back towards the golden Sun. The start and finish give the route an easy-to-follow structure: the Sun model marks the beginning, and Pluto the end. The 6.8 km distance is a useful guide when deciding whether to include the walking trail as a planned activity during your stay.
Sizes and distances at the same scale
The model depicts the sizes and distances of the Sun and planets uniformly at a scale of 1:1 billion. This ratio means that one unit of measurement in the model corresponds to one billion of the same units in the actual Solar System. Since sizes and distances are shown using the same scale, both aspects can be considered together: How large do the celestial bodies appear in relation to one another, and how far apart are they in proportion? This combination is what gives the walking trail its theme. For travellers interested in astronomy, its particular appeal lies not only in the endpoint, but also in what a shared scale reveals about dimensions.
When planning, it is worth distinguishing between two different scales: the 6.8 km refers to the length of the walking trail, while 1:1 billion describes the ratio between the model and the Solar System. The first figure helps you estimate the extent of the route; the second explains its astronomical theme.
More to explore in the wider Passau travel region
In the wider Passau travel region, the Bavarian Forest Museum Village in Tittling offers a very different focus. It is one of Europe’s largest open-air museums; across 20 hectares, visitors can explore more than 100 residential and farm buildings from the Bavarian Forest dating from 1580 to 1890. The collection ranges from farmhouses, mills, sawmills and smithies to chapels and field monuments. It also includes Germany’s oldest primary school, dating from 1666. The historical period and range of building types offer a perspective that differs markedly from the astronomical scale of the walking trail in Sonnen.
The Haus am Strom nature experience centre is also part of the wider Passau travel region. It is located in the narrow Bavarian-Austrian Danube valley below Untergriesbach. Another regional landmark is the Danube Cycle Path, which runs through the Passau region; after an assessment by the German Cyclists’ Federation, it received a four-star rating. If you use this award to inform your choice, check the current certification status, as it may change.
Discover more destinations: Thyrnau, Tettenweis, Windorf, Aldersbach, Ruderting, Witzmannsberg, Untergriesbach, Breitenberg
Back to the wider travel guide: Passau.
