Astronomical observation site selection

For astronomical observation, it is absolutely impossible without a good venue. The environment around the observation site directly affects the observation effect: if there are too many obstacles, it is difficult to see the observation target clearly, let alone observe it; If the airflow changes too much, it will cause image jitter and deformation, reducing the resolution of the telescope; If the sky is illuminated by lights, the limit magnitude (the magnitude of the darkest star visible to the naked eye) will be reduced, in other words, the number of stars seen will be reduced, which will have a great impact on observation and photography, even impossible ... In order to achieve the expected effect of observation activities, it is necessary to choose a suitable venue, and the following points should be paid attention to when choosing: with the development of economy, there are more and more lights in cities, and the sky is illuminated more and more. Although you can't stop the city from developing for observation, we can take the initiative to avoid the lights. In the United States, it is not uncommon for astronomy enthusiasts to drive dozens or even hundreds of kilometers to observe in the wild in order to avoid the influence of light-we can only learn from their practices and find a place that we think is dark enough-of course, it should be a place we are familiar with, and never go to the wilderness we don't know, so as to avoid danger.