Stonehenge Landscape Flyover

 Fly over the Stonehenge landscape, and watch the sun rise in 2500 BC

I've put a new tool online: a 3D flyover of the Stonehenge landscape, not just Stonehenge but also Woodhenge and the new Bulford post alignment. It runs in your web browser, there's nothing to install.

https://timdaw37.github.io/stonehenge-landscape-flyover/

The ground is built from Environment Agency lidar, with Ordnance Survey terrain for the distant hills and the rivers. On it sit the monuments from Historic England's mapping. Stonehenge has its stones on their surveyed positions, Woodhenge has its post rings from Maud Cunnington's 1929 plan, and there's the newly found pair of posts at Bulford. A period slider lets you strip the landscape back from the Early Bronze Age to the Mesolithic and watch it fill up again.

You can fly with the mouse, keyboard or the touch pad in the bottom right corner, which also works on phones and tablets. Double-click anywhere to fly there, or press P for a plan view.

The part I find most useful is the alignment check. Choose a site (Stonehenge, Woodhenge or the Bulford post axis), then an event such as midsummer sunrise, midwinter sunset or a lunar standstill, and pick first gleam, half disc or full disc. It works out where and when the sun or moon clears the real skyline, as seen from that spot, for 2500 BC or any year you choose. It then puts you there, looking at it. A Details button gives the full workings: the true azimuth, the time, and the horizon that was used.

Everything behind the site is open on GitHub, so anyone can take it and build on it:

https://github.com/TimDaw37/stonehenge-landscape-flyover

It's shared under a Creative Commons licence (CC BY-SA 4.0). Use it, change it, and add your own sites or ideas, as long as you credit where it came from and share your version in the same way. 

It's still a work in progress. If you spot anything wrong, from a misplaced monument to a sunrise that looks off, please let me know in the comments.