suncalc.js - SunCalc (v1.9.0)
Source: https://github.com/mourner/suncalc
Original author: Vladimir Agafonkin (mourner)
License: ISC (https://github.com/mourner/suncalc/blob/master/LICENSE)
Used under the terms of the ISC License.

stars.json - star catalogue derived from the Yale Bright Star Catalogue
(5th ed., public catalogue data). Generated for this project; see the
real-sky notes in clouds3d.js.

plane3d.js - low-poly airliner mesh (599 triangles, flattened, no textures)
Derived from 'Passenger Airplane' by Grab3D (https://grab3d.com), CC0 1.0
(public domain dedication). Decimated and repacked for this project; the
derived mesh is offered under CC0 as well.

clouds3d.js - original code for this project (same license as the
repository root LICENSE).

These libraries/data files are vendored locally so the application can
run fully offline without any external network dependencies.