What are the influence factors of the astronomical telescope?

What are the factors that affect the observational factors of astronomical telescopes?

1, the motion of the earth's atmosphere causes bad images at high magnification.

2, the hot air on the earth's surface can also distort and distort the image.

3, if the measured star approaches the horizon, it will be blurred.

4. Pollution of urban light source.

5, the moonlight is also a factor affecting the observation.

6, try to avoid indoor observation (and not to observe through closed windows).

7, the clouds accumulated in the sky can not penetrate the observation. The eight is that the twinkling of the stars will also affect the observation.