Generate Coordinates Given Distance, Angle From A Center

I have a given center in the map [x1,y1]. From that center I am drawing a circle with a 1 mile radius. I need to generate 8 more points around the circle, the distance between the

Solution 1:

You are trying to solve what is known as the first (or direct) geodetic problem. Knowing this name will make your research easier.

As pointed out by the answers to "How to draw polyline perpendicular to another polyline using Leaflet" and "Find destination coordinates given starting coodinates, bearing, and distance", your main options to approach this problem in javascript are cheap-ruler for small(ish) areas and greographiclib for large distances.

cheap-ruler tends to be very fast but inaccurate, and geographiclib tends to be slower but very accurate.

You might find other implementations, each with its own compromises. Geodesy is hard, so there is no "one true way" to calculate distances or azimuths.