How can I take a good photo of a star?

The object of celestial photography is generally weak in light and needs a long exposure to shoot. The time is usually more than a few minutes. But there is a problem with this approach. The earth is about to rotate, and long exposure is to shoot moving targets. So celestial photography generally has two ways:

1. Fix the camera on the ground and shoot behind closed doors. After such a long exposure, the photo will be concentric circles, which is the reaction of the stars in the photo because of the rotation of the earth. The smallest circle in concentric circles is Polaris, because Polaris is not completely in the North Pole, and there is still a short distance from the North Celestial Pole. In this way, the diagonal lines intersecting these concentric circles are celestial bodies such as meteors;

2. Connect the camera to the equatorial plane. This device can turn from east to west to offset the influence of the earth's rotation. After shooting in this way, the bright spot on the photo is the star, and the straight line is the meteor. But after this shooting, the ground in the photo is blurred. This method is generally used to photograph deep space objects such as nebulae and galaxies.