How to shoot this effect? (Explain from the perspective of SLR photographic data or shooting method)

This kind of photo was not taken by one photo. It was shot by splicing, that is to say, it was completed by splicing nearly ten photos. I often like to shoot like this.

The method is:

1, first use the aperture priority mode, select an aperture (for example, 8), and you can measure the speed (for example,1125 seconds);

2. Then set the camera to manual mode, with the aperture set to 8 and the speed set to1125 seconds;

3. Shoot continuously from left to right, and the last photo overlaps with the previous one by at least 2/3, that is, the scene of the last photo overlaps with the previous one by 2/3;

4. These dozens of photos are connected by PHOTOSHOP photomerge (generally choose "cylinder");

5. Trim, cut and output photos.

I took the picture below.