This photograph was taken by me in late evening it took me around 20 25 minutes to take this photo This is my first attempt in star trail I know it is not a good result if we see through an eye of a photographer.
But then also I wanted to post it. If I talk about the technique then I used f4 as my aperture shutter was 30' seconds and ISO was 100. I took around 16 photos Without disturbing my camera I wish I had an intervalometer then. I stacked all 16 images in photoshop later that game me the mind blowing result
A pro tip you can use this technique to reduce noise from your photo as well.