"I wonder what it will be like to look at the stars in the sky?" Yan Su held the binoculars, looked at the gradually darkening sky, and muttered in his mouth. Pen "Fun" Pavilion www.biquge.info

As a person who is obsessed with scientific inventions, the sun, moon and stars in the sky are full of temptations, and their various wonderful forms are fascinating to think about. In particular, Yansu has observed the changes of the moon phase for a long time, and finally discovered the close connection between the tide and the change of the moon phase.

The celestial supervisors who observe celestial phenomena all year round naturally know that the celestial bodies are constantly moving and changing, and they have to proofread the observed celestial phenomena with the armillary sphere and other calculation results, and even accurately calculate the solar and lunar eclipses. One of the most important reasons why the calendar is constantly changing in this era is that the measured solar and lunar eclipses do not match the actual time, and there will be deviations every few years. On the same day, the time is not right, and it is reluctant, and the calendar will be changed by more than a day.

In the eyes of these people, celestial phenomena are actually not so mysterious, and even the most popular theory of armillary heaven is that the sun, moon and stars are constantly moving around the earth. Being able to see the vast starry sky is the wish of many people, and they can solve the countless mysteries in their hearts when observing the starry sky. Although it is necessary to attach the celestial phenomena to the Five Elements Doctrine and talk about disasters and other things, those people may not really think so in their hearts, and the calculation of various celestial phenomena requires a combination of real mathematical knowledge and celestial observation.

In many cases, for the special celestial phenomena observed, the personnel of the Si Tianjian must not only interpret them according to the astrological classics that have been circulated since ancient times, but also adapt them to the specific political situation. For example, Zhenzong Jingde has been in a five-star series for four years, and Si Tianjian reported that "the five stars gather and crouch in the quail fire", which has obvious political implications of whitewashing the peace.

There are astronomical institutes and bell and drum courtyards under Si Tianjian. The Bell and Drum Institute is dedicated to timing, entering cards and other affairs, and of course also working part-time to make timing tools. The Astronomical Institute mainly observes celestial phenomena, and dozens of people observe the changes in the celestial phenomena day and night, check the results of the armillary sphere at any time, and report to professionals for analysis.

With the telescopes, the sights of the heavens were very different from before. You can see the moon clearly, and you can even see the general terrain above, so you don't have to guess what's on it. The five stars no longer have a sense of mystery, and even other solar planets that were previously invisible to the naked eye can even be seen by care, and the content of astrology is not yet known to be greatly changed. At least the famous sentence "five stars out of the East is beneficial to China" is not very tenable, both the "Historical Records" and the "Book of Han" clearly say that the five stars out of the East are conducive to China's use of troops, and the West is beneficial to foreign countries, and now it is likely to have two more stars, so how should it be calculated?

With these astronomical instruments, the celestial phenomena will be seen more clearly and the calendar will become more precise, but the astrologers will be in trouble, they will find many celestial phenomena that they have not seen before, and they will not know how to attach them.

But in any case, the more clearly you can see the sky, the less mysterious the color will become, the less reverence for the sky will be, and the more you will pay attention to people themselves, which is not a bad thing.

Walking into the courtyard with a telescope, Yan Su took a breath and raised it to look at the gradually darkening sky.

Xu Ping didn't know what he saw, but he saw that his expression was serious, even with a sense of sacred solemnity. This kind of feeling is incomprehensible to Xu Ping, this is the gap between the times.

After looking at it for a while, Yan Su put down the telescope in his hand and said to Xu Ping: "Xu Beizhi, can you lend this telescope to the old man and bring it back for a day or two?" I was friendly with Si Tianjian Cheng Chuyan and showed him what the stars in the sky were. ”

"What's there, of course. If you can make the first one, you can make more, and this kind of thing will not be so strange in the future. Xu Ping originally wanted to tell him that he also wanted to try several other imaging forms, but then he thought about it, it would be better for him to go to Si Tianjian to find out the bottom first, and see how well they were receptive.

The first is the simplest form of concave-convex mirror, generally known as the Galilean telescope, which is simple in structure and easy to make, but correspondingly large in size, small in magnification, and small in field of view. Xu Ping also wanted to try the convex and convex mirror form, which was relatively much better, but it became an inverted image, called Kepler.

Of course, Xu Ping can't remember these terms, but the laws of optics are not complicated, and they can even be said to be very simple, and what is really needed is actually mathematical knowledge. To put it bluntly, the telescope means that the focus of the two lenses coincides, so as to expand the field of view and magnify the scene that can be seen in the field of view. Xu Ping still has the required mathematical knowledge, whether it is a convex mirror and a concave mirror, or even a spherical mirror, an elliptical mirror, a parabolic mirror, or a hyperboloid mirror, Xu Ping can easily calculate the focus. With all kinds of lenses together, and then with the refractive prism, Xu Ping didn't know how many kinds of telescopes and microscopes he could build. It just depends on the usefulness, on his own time and energy.

But what Xu Ping wants to do most now is not these, but reading glasses, which is a money-making product.

In this era, there are very few people like Xu Ping who are high-ranking officials in their twenties, and it is no exaggeration to say that he will not do anything in the future, and he can leave his name in history just by virtue of his age and resume. Most officials do not move forward until they are forty or fifty years old, or even sixty or seventy years old, and their eyes are spent at this time.

Every time he went to court, Xu Ping was surrounded by a group of gray-haired old men, and his eyes were not normal at all. If you have reading glasses, not to mention others, the high-ranking officials in the court alone are enough to support a huge market.

How can you not do this kind of business that lies down and makes money? The people who have been made by him are still grateful to Dade!

Unlike previous lives, myopia glasses have little significance. First, for various reasons, although there are people with myopia, the absolute number is not much. Again, the short-sighted are young, and the bitter young scholars can't afford this luxury.

Reading glasses are different, most of the people who have this kind of demand are rich and noble, officials and powerful, and have demand and spending power. Even if it is an ordinary family, many children will buy a pair for their parents for filial piety.

Thinking about the deliberations in the palace in the future, a group of ministers all wore reading glasses and looked at the recital seriously, and the more I thought about it, the funnier it became. It's just that I don't know if I'll fall into this situation when I'm old.

Thinking of this, Xu Ping asked Qiu Zhizhao: "A few days ago, didn't you let the high feet of the Zhaozhao grind some thin lenses?" I don't know if it's polished, but I'm also useful. ”

"Well, those have been sharpened for a long time, and those are much easier. It's just that the deputy envoy said that he didn't need it urgently, so he kept it here. Qiu Beizhao said as he turned to get the lenses. (To be continued.) )