Chi. Chikyuu no Undou ni Tsuite

• After watching Vinland Saga if you are carving for most realistic history drama set in Europe than watch Orb: On the moment of the earth. • Both the anime are quite philosophical and feels very real since both are inspired or loosely based on real life events. • Both the anime have similar vibe. The art and animation in both the anime is beautiful as well.  

Both are about finding truth of the world 

1. Knowledge for High Stakes - Each Main Character has an obsession towards books and knowledge. They will do the extremes, no matter what the high stakes can be, just to get the knowledge they want. 2. European Setting - If you're fond of Western Medieval settings in books, games, or anime, look no further. Each anime is set in Europe. While the Orb is set into the Medieval Poland where there's a discrimination towards Heliocentrism guided by the Church and its Geocentrism. The country where Ascendence of Bookworm takes place is in isekai Europe, where magic also exists, however it's not stated where exactly the country the setting took place at. 3. Reading and Writing are considered special skills - Each skill is considered a very valuable skill, and is only given to a select few individuals, most prominently the nobles or the higher ups of the authority. 4. Unique Main Characters - The only difference is that The Ascendance of Bookworm has a distinctive Main Character named Myne, the Orb however has... a unique writing which I'll only leave it with your imaginations, or even better, go and watch Orb to see the full details. Another word would be consider a "Spoiler" at this point. read more 

Both talk about knowledge and how meaningful it can be, which is what makes it so comforting in a way. Both are really good at it. Dr. Stone is more dynamic, current, and comedic, while Chi is darker, more serious, and speaks from a past perspective. But despite these differences, both are really good anime. Watching Chi gave me the same feeling I had when watching Dr. Stone, it gave me goosebumps because the incredible nature of knowledge makes it something very interesting to watch and truly moving. Also, both have an incredibly good soundtrack. 

Both are about astronomy and they look at the skies. 

Orb feels highly inspired of Berserk; the medieval ambience, the existential questions, the corruption of the church, the inevitable violence, suffering and death. If you remove the immortal hero, the wars and the supernatural from Berserk, you're pretty much left with Orb. Highly recommended.  

There's a similar philosophical vein in Kino no Tabi as in Orb, and there's in many ways a similar atmosphere with different settings, people and cities. There's also a similarly laidback pace coupled with very serious topics which creates a quite different and interesting watching experience.  

Both have a narrative that spans across generations Both have impactful deaths that drive the story forwards Both have a theme of transferring ideas and knowledge. In To Your Eternity, this is in the form of memories and experiences of those he encounters. In Orb: On the Movements of the Earth, its scientific knowledge about heliocentrism being passed down through generations. 

Astronomy. There are not many recent anime out there with astronomy theme, so if you like the theme check them out. Chi is more serious, emphasizes on historical discoveries and takes place in 15th century Poland while Insomnia is more lightweight, focuses more on photography and takes place in modern Japan.