Ask god for an answer. What is the limit magnitude that Nanning can see at midnight? When the weather is fine (in Nanning), you can see some with the naked eye.

I haven't been to Nanning, and I'm not very clear about it. I dare not jump to conclusions here. However, from the city where I live in Shanghai, I should be able to give some reference to the landlord.

The Bund, the most prosperous place in Shanghai, has a limit magnitude of about 2.5-3.0. On New Year's Day this year, I saw the constellation β(2.6, etc. ) On the Bund Trail. My high school, Gezhi Middle School, the school closest to the city center, avoids street lamps in the school yard, and the maximum magnitude can reach about 3.0.

Of course, in less prosperous places, light damage conditions will be better. Home and school are near Central, and the general limit magnitude is around 4. 1, which can reach 4.5-4.6 at most. Once at school, Gemini counted to 13 stars, and five princes could see four of them. Of course, this condition is only one tenth, and it is about ten times a year.

As for the observation effect in such an environment, it is difficult to see nebulae, because nebulae are generally diffuse, with low brightness per unit area and are more vulnerable to light damage. In my familiar environment, there are only three deep spaces that can be easily distinguished by naked eyes-M45, M42 and M7, and the second is Orion Nebula. From this perspective, we can also give a positive answer.