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Star trails and sky quality

Star trails are photographs that can be used to indicate the visibility or sky quality of a particular location. Shows that the sky conditions throughout the night have good visibility suitable for astronomical observations.

This photograph of star trails Recorded in the Aoraki Mackenzie International Dark Sky Preserve, New Zealand. Outstanding Astronomical Attractions Perfect for stargazers and photographers who are fascinated by the beauty of the stars under a pitch-black sky. In this shot, the photographer had to wait patiently for hours of continuous shooting. to get the longest starlight Caused by the rotation of the world itself. thus allowing us to see the stars in the sky moving and changing positions In which all stars revolve around the southern pole of the sky itself.

However, the motion of star trails is different. In some images the stars move in circles. Some images are horizontal. Oblique to the left, some right, according to the latitude of that place, because the world rotates in a way around its own axis. The axes are North Pole and South Pole. For example, when we face the camera towards north or south. which is the axis of rotation of the world We will get an image of starlight moving around the celestial pole, but if we turn the camera to the east or west.

We will get an image of starlight moving horizontally. Which the movement of the celestial sphere revolves around the earth 1 time, takes 1 day (24 hours), allowing us to see the stars moving along the celestial sphere at a rate of 15 degrees per hour. It will take longer to take pictures according to the movement of the celestial sphere as well.

In the past, star trails captured by film cameras were shot with the camera open for hours. Which the resulting image will be a small line of starlight, but usually not very long Because the camera is left open for a long time, the light will accumulate more and more, making it take longer to take pictures. The picture will be brighter. and may cause the image to be too bright that the details are lacking

At present, the method of photographing star trails is We will use a continuous photography method and then combine the images to get a beautiful starlight image as shown in the picture.