Observing sundial and engraving is the basis for measuring the correct appearance of heaven and earth. Among them, sundial has been made.
This thing is not difficult to do. To put it simply, you only need to know how to measure the sun shadow. As a girl who often leads a group of dog-headed teammates and runs around in the deserted desert, she naturally knows the sun shadow. measurement method.
And among those dog-headed teammates, there are also many people who know how to do it.
So neither Yuzai nor Dayi were bragging. They did have many friends, but Dayi's friends were not in the south, and Yuzai's friends... were not in this world.
The first sundial was made of wood. Generally speaking, it was relatively successful. The same is true for the standard watch on the side. This one is even simpler. In fact, the sundial does not need to mark twenty-four hours, which is twelve o'clock, because it cannot be seen at night. The sun and the moon's light are not counted because there is a "moondial" that measures time based on the moon alone.
However, the production of a moondial is more than ten times more difficult than that of a sundial, and the accuracy is definitely not enough. It also requires an observation form to assist the operation and calculation, which is generally more troublesome.
"Cut a disc out of wood and draw the disc into twenty-four equal parts. Each equal part is further divided into three smaller equal parts. Then the angle of each equal part is five degrees, representing twenty minutes... ..”
"Put the wooden needle through the center of the circle..."
So, here's the key point, Yu Zai doesn't know the latitude of his area, so he doesn't know the tilt angle.
But Yuzai was not in a hurry at all. This needle was the core of this simple instrument, and its tilt angle must be correct. When the latitude of the location is not known, one thing is needed - the North Star.
The tip of the needle must be pointed at the North Star.
I still don’t know what kind of world the world of mountains and seas is, but when I think about it, the movement of the sun, moon, and stars is not much different from the previous life. As a geologist, I can see at a glance that these stars are almost not too big. Variety.
At least the scattered superficial knowledge of astronomy from his previous life can still be used.
Of course, longitude and latitude are still important, but now, here, there is no way to judge the longitude and latitude of the mountains and seas based on the geographical longitude and latitude of the past. Even though the stars in the sky are the same, the mountains, swamps, and terrain are very different. .
But at least the sun, moon and stars remain unchanged. Even if the time is very blurry now, the latitude and longitude can still be calculated.
Just look at the latitude to see the elevation of Polaris. As for the longitude, you must wait until the "accurate time" of the first day is calculated before subsequent calculations can be made. This is also a problem that troubled all wise men in ancient times. It was not until the mechanical clock was Accurate calculations can only be made after it is manufactured. In the past, they were all rough calculations, but Yu Zai felt that it was just a rough estimate. There were not many places where it would be used anyway. The biggest use of this thing was going to sea.
Going to sea? It's early! Besides, I don’t have a single shellfish on me, so why go to sea?
At least until we get the pendulum clock out, it's almost done, and it's not particularly difficult...
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; when the sun sets and the moon rises, darkness and death arrive.
Legend has it that the Queen Mother of the West lived in the Kunlun Mountains of the Western Wilderness, which should be the later Qilian Mountains, near Qinghai. She had the elixir of immortality, but this was just a legend. Every certain age, the Queen Mother of the West, as the king of the mountains and seas in the west, would When I came to the Central Plains to meet the Emperor of Heaven, as for the medicine of immortality, a great shaman from the Queen Mother of the West once said with a smile: If people can live forever by eating grass, then the gods should go to the Western Wilderness instead of far away to the stars.
There is an elixir of death, but it is by no means as mysterious as the legend says.
Yuzai has seen the North Star.
Instructions for using the sundial: Please face the dial to true north when using it.
Ruzai thought about it, put this thing here, calibrated it, and left with Dayi.
Tomorrow morning may be the moment to witness a miracle.
The grass was stirred up by Yu Zai's hands, and it swayed, and a few dots of fluorescence flew out.
"It's Liuying."
Dayi looked at the grass, he blew a breath, and many fireflies slowly flew out of the grass.
Mountains grow dim, rotting grass turns into fireflies, broken bamboos are replaced, and bells and stones change their sound.
Yu Zai didn't know why, but he remembered this prophecy.
Here, the scene of rotten grass turning into fireflies really appeared.
There are three kinds of fireflies: one is small and flies at night, with bright light under the belly, which is transformed from the roots of grass. Lu's "Yue Ling" said that "the rotten grass turns into fireflies" is this type.
One kind is as long as a maggot candle, with light behind its tail. It has no wings and cannot fly. It is a pseudonym for a bamboo root, and its common name is a firefly maggot. This is what Mingtang's "Yue Ling" said "rotten grass turns into a cockroach", and its name is Xiaoxing. The roots of the bamboo can see light at night, sense the damp and hot air again, and gradually change and form.
A kind of water firefly, living in the water, as mentioned in "Ode to Water Fireflies" by Ji Ziqing of the Tang Dynasty, "What does that other one do and turn into grass, what does this one do and live in a spring" and so on.
Of course, people in ancient times believed that human essence, blood, and soul would also turn into fireflies, gathering and dispersing like light. There were such records in the time of Emperor Huai of the Jin Dynasty. However, in the era of mountains and seas, fireflies were still fireflies.
Tonight, the moon is not full.
But even though he was dissatisfied, he still had his brilliance.
"Legend has it that Chang Xi touches the moon and gives birth to the twelve-month flower..."
Dayi began to tell ancient fairy tales. Xihe and Chang Xi were the gods in charge of the movement of the sun and the moon, and their descendants were the Xi family, the He family, and the Chang family family.
"This is very ancient. Although the Xi family and the Xi family are separated in the Central Plains, they are a family. Just like the Yandi family, they are ancient clans left over from a long time ago. Before Emperor Zhuanxu, they were probably the Yellow Emperor or At the end of Emperor Yan's reign, Xihe was already responsible for observing the astronomical phenomena."
"Chang Xi, this goes back to Chang Xian and Chang Yi during the Huangdi period."
"Xi He governs the sun, Chang Xi regulates the moon, and Huang Di distributes the calendar in the world. These two clans have always been responsible for watching over the movement of the sun and the moon and recording the seasons. Of course, as for the gods who originally worshiped the sun and the moon, and welcomed the sun and the moon. ....I once traveled around the mountains and seas, and experienced the wilderness in all directions. Among the gods who were sealed off in various places, there was the god of the sun and the moon..."
"Therefore, the two gods Xihe and Changxi are said to be the wives of Emperor Kuang and the ancestors of the Sun and Moon clan in the Central Plains."
There were many gods of the sun and moon in ancient times. Not to mention the sun god, the moon god was the most well-known later...perhaps Chang'e, who was not the moon god but lived on the moon.
After Changxi, there is Wangshu, and after Wangshu, there is Xian'a.
Chang Xi has both personality and divinity, and is called the Moon Mother; Wangshu is a goddess who likes to fight, has a pure character, and is the Yue Yu; Xian'a is the goddess who makes the monthly calendar on a high mountain. She is also the Yue Yu, but This Yu means "control", and Wangshu's Yu means driving the moon, which is the same as Xihe.
