Observing sundials and carvings is the basis for measuring the heavens and the earth, and sundials have been made.

This thing is not very difficult to do, to put it simply, you only need to know how to measure the shadow of the sun, and as a person who often leads a group of dog-headed teammates to run around in the desert, he naturally knows how to measure the shadow of the sun.

And among those dog-headed teammates, there are many people who will.

So Yu Zai and Dayi are not bragging, they do have a lot of friends, but Dayi's friends are not in the south, and Yu Zai's friends are ..... Not in this world.

The first sundial is made of wood, in general the production is more successful, the same is the same for the side of the watch, this is even simpler, the sundial does not need to mark twenty-four hours, that is, twelve hours, because the sun can not be seen at night, as for the light of the moon is not counted, because there is a separate "moondial" according to the moon to measure the time.

However, the production of the moondial is more than ten times more difficult than that of the sundial, and the accuracy is inevitably insufficient, and an observation table is also needed to assist in the operation and calculation, which is generally more troublesome.

"Cut a disc on a piece of wood, draw the disc into twenty-four equal parts, and divide each equal into three small equal parts, so that the angle of each equal division is five degrees, representing twenty minutes ....."

"Thread the needle through the ..... of the center"

So, the point is that Yu Zai doesn't know the latitude of his area, so he doesn't know the angle of inclination.

But Yu Zai is not in a hurry, this needle is the heart of this simple instrument, its angle must be correct, and when you don't know the latitude of your location, you need to use one thing - the North Star.

The tip of the needle must be aimed at the North Star.

So far, I don't know what kind of world the mountains and seas are, but thinking about it, the movement of the sun, moon and stars is not much different from the previous life.

At least, the scattered knowledge of astronomy in previous lives can still be used.

Of course, latitude and longitude are still important, but now, here, there is no way to judge the latitude and longitude of mountains and seas by the latitude and longitude of the geography in the past, even though the stars in the sky are the same, but the mountains and rivers, the direction of the terrain, but there is a big difference.

But at least the sun, moon and stars remain the same, and even if the time is very vague now, the latitude and longitude can still be calculated.

The latitude can look at the elevation angle of the North Star, as for the longitude, you must wait for the first day of the "precise time" to be calculated, before you can carry out subsequent calculations, which is also a problem that plagued all the human sages in ancient times, it is not until the mechanical clock is manufactured that the accurate calculation can be carried out, the previous ones are roughly derived, but Yu Zai thinks, roughly it's rough, anyway, there are not many places to use, and the biggest use of this thing is to go to sea.

Besides, I don't have a single shell coin on my body, so why go to sea!

At least until you get the pendulum clock out, it's almost there, and it's not particularly difficult to get around.....

The view of heaven and earth in the Classic of Mountains and Seas is very vague, the sun and the moon rise in the east and set in the west, when the sun rises and the moon sets, everything in the world is renewed, and when the sun sets and the moon rises, the darkness dies.

Legend has it that the Queen Mother of the West of the Western Wilderness lives in Kunlun Mountain, which should be the later Qilian Mountain, near Qinghai, she has the medicine of immortality, but this is just a legend, every certain age, as the king of the mountains and seas of the West, the Queen Mother of the West, will come to the Central Plains to meet the Emperor of Heaven, as for the medicine of immortality, there was once a great witch of the Queen Mother of the West and said with a smile: If people can live forever by eating grass, then the gods should go to the West Wilderness, not go away to the stars.

The elixir of immortality exists, but it is by no means as mysterious as the legend suggests.

Yu Zai has already seen the North Star.

Instructions for use of sundials: Please use the dial facing due north.

Yu Zai thought about it in pieces, put this thing here, and after calibration, he left with Dayi.

Tomorrow morning may be the time to witness the miracle.

The grass was stirred up by Yu Zai's hand, and it swayed inside, and a bits or two of fluorescent light flew out.

"It's a firefly. ”

Dayi looked at the grass, he blew, and a lot of fireflies slowly flew out of the grass.

Even the mountains are obscure, the rotten grass turns into fireflies, the broken bamboo continues to bamboo, and the bell stone changes its voice.

Yu Zai didn't know why, so he remembered this prophecy.

Here, there is really a scene of rotting grass turning into fireflies.

There are three kinds of fireflies: one is small and flies at night, and the belly is bright, which is transformed by the root of the grass, and the so-called "rotten grass turns into firefly" in Lu's "Moon Order" is this type.

A kind of long as maggot candle, there is light behind the tail, no wings do not fly, it is the pseudonym of the bamboo root, the common name is the maggot, the so-called "rotten grass into a worm" in the Mingtang "Moon Order" is also, its name is the night line, the root of the thatched bamboo, the night vision has light, the complex feeling of dampness and heat, gradually changed and formed.

A kind of water firefly, living in the water, Tang Ji Ziqing's "Water Firefly Fu" so-called "what is he doing and turning grass, what is this and living in the spring" and so on.

Of course, people in ancient times believed that people's essence and blood and soul would also turn into fireflies, gathering and scattering like light, and there were such records when Emperor Huai of the Jin Dynasty, but in the era of mountains and seas, fireflies were only fireflies.

Tonight, the moon is not satisfied.

But although dissatisfied, there is still a shining brilliance.

"Legend has it that Chang Xi Muyue was born in December and ......"

Dayi began to tell the old fairy tale, Xi He and Chang Xi are the gods who control the movement of the sun and the moon, and their descendants are Xi, He and Chang.

"This is very ancient, although the Xi clan and the clan are separated in the Central Plains, they are originally a family, like the Yan Emperor clan, it is an ancient clan left a long time ago, before the Emperor Zhuan, about the time of the Yellow Emperor or the end of the Yan Emperor, the Xi He clan was already responsible for observing the celestial phenomena. ”

"Chang Xi, this can be traced back to Chang Xian and Chang Yi during the Yellow Emperor period. ”

"Xi and the rule of the day, Chang Xi Liyue, the Yellow Emperor calendar in the world, these two have also been responsible for the operation of the sun and the moon, responsible for the work of recording the season, of course, as for the original sun and moon, the god of welcoming the sun and the moon..... I have traveled all over the mountains and seas, experienced the great wilderness in all directions, and among the gods who have been sealed in various places, there are gods of the sun and the moon......."

Therefore, Xihe, the two gods of Changxi, is said to be the wife of the emperor and the ancestor of the sun and moon in the Central Plains. ”

There are many ancient gods of the sun and the moon, not to mention the god of the sun, the god of the moon, the most known in the later ... Maybe it's a lady who doesn't live on the moon but doesn't have the moon god.

After Changxi, it is Wangshu, and after Wangshu, it is Xian'a.

Chang Xi has both personality and divinity, called the Moon Mother, Wangshu is a goddess who is good at fighting, with a pure personality, is the Moon Emperor, and Xian A is the goddess who formulates the lunar calendar on a high mountain, she is also the Moon Emperor, but this Yu means "control", and Wangshu's Yu is for the moon to drive, which is the same as Xihe.