I want to buy an astronomical telescope.

About 2000 yuan, you can buy a set of domestic common achromatic refraction astronomical telescope with a diameter of 80 mm, including tripod and simple equatorial telescope (or theodolite). The recommended brands are Sirius, Guanbo, Daguan and Jinghua. It is suggested to go to Mufu Astronomy Forum, Tianzhiwen Forum, Astronomical Friendship Forum and Astronomical Home Forum before making a decision. Many researchers have rich experience in purchasing, testing and evaluating astronomical equipment.

How far can you see? The question itself is meaningless, because the moon, the sun and the stars are far away from us, but we can see them without a telescope. The advantage of the telescope is that it can see more dark stars and more details than the naked eye, that is, the light gathering ability and resolution are higher than those of the human eye.

Let's talk about it at last. The light collection capacity of an 80 mm ordinary refracting telescope is 30 times that of the human eye, and dark stars such as 1 1 can be seen (the human eye can see up to 6 stars). Its resolution is 20 to 30 times that of the human eye, and you can see craters and many details on the moon. You can also see details such as Saturn's rings, stripes on Jupiter and Jupiter's four Galileo satellites.

The magnification of a telescope is equal to the quotient of the focal length of the objective lens divided by the focal length of the eyepiece. Generally, the focal length of an 80mm telescope is between 500 and 900mm. The appropriate magnification is 50- 150 times, and eyepieces with different focal lengths can be changed into different magnifications.