At Under Lucky Stars, we are making our star maps with the greatest possible attention to scientific accuracy. We use the Bright Star Catalog from Yale University as our main source of celestial data, among several other astronomical databases. It contains galactic coordinates of all the stars visible from Earth with the naked eye. These coordinates place each star in a galactic coordinate system. When creating a map, we process six high precision data points of over 9,000 stars. We are proud to have been audited by an independent astronomer, you can read more about the verification process here: https://www.underluckystars.com/astronomically-verified
For the position of a star in the sky at a particular place and time on Earth, we calculate the azimuth and elevation of the star, based on the geolocation and time coordinates from that special moment chosen by you. The complex astronomical calculus involved in celestial mechanics ensures high fidelity and uniqueness of each map.
Once we have the position of each star in the sky, we draw a stereographic projection of the celestial hemisphere with all the visible stars. Through experimentation, we found that this particular projection creates the most visually pleasing and easy to follow map.
Please go here to design your own star map: https://www.underluckystars.com/designer