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Wait for a clear sky. Account for moonlight. Find a dark location. Search for interesting landmarks.
You will need a clear view of the sky to take a good star trail photo. Check the weather forecast for your location ahead of time. Only go on a clear (cloudless) night. Also, be sure that there are no other obstructions (such as a forest canopy) blocking your view of the stars. Getting away from artificial light is not always enough to eliminate light pollution. A bright moon can cast enough light to interfere with you photo, and make the stars hard to find. Plan ahead of time to go out on a night when moonlight is negligible (a new moon is the best). You want to reduce any interference (known as noise) with your picture. This means eliminating as many light sources as possible. Go away from cities and find a remote location with no artificial lights. Old buildings or monuments can make an interesting foreground for your star trail photo. You can also place natural formations such as mountains, trees, or caves in the picture. Having an interesting landmark will give the picture more more substance and make it more captivating.