Constellation illustrations: Johan Meuris, distributed by Stellarium.
Free Art License: https://artlibre.org/licence/lal/en/
Original images, unmodified: https://github.com/Stellarium/stellarium-skycultures/tree/master/western/illustrations
Artwork displayed at reduced opacity and projected using three star anchors.
Anchor data: Stellarium team, CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0/).
Source: https://github.com/Stellarium/stellarium-skycultures/tree/master/western
RA/Dec lookup: d3-celestial Hipparcos catalog https://github.com/ofrohn/d3-celestial
The included anchors.json adaptation is also available under CC BY-SA.