The Photographer's Ephemeris
I'm not sure if this has been discussed before. There is a free (desk top) app called the Photographer's Ephemeris. it shows the angle of the sun and moon at any moment on any day anywhere in the world. If you need to know on what day will the sun rise directly over something , you can know without trial and error, I find it essential for autonomous drone flight programming and sunrise photos and videos.
There is also an IOS app but that is not free.