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 person who often runs around in the deserted desert with a bunch of dog-headed teammates, 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 in making it. The standard watch on the side is the same, but 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 certainly insufficient. It also requires an observation form to assist operations and calculations, 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"
Well, here's the key point, Yu Zai doesn't know the latitude of his area, so he doesn't know the tilt angle.
But Yu Zai was not in a hurry at all. This needle is the core of this simple instrument, and its tilt angle must be correct. When the latitude of the location is not known, it is necessary to use an east-west 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 actually 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 the 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 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 use latitude to see the elevation of Polaris. As for 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 idea. There are not many places where it would be used anyway. The biggest use of this thing is 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. It's not particularly difficult to do.
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, 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, the king of the mountains and seas, 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 traveling 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 already 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 by Yu Zai's hands, and it swayed, and one or two fluorescent lights 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, bells and stones change their sound.
Yu Zai didn't know why, but she remembered this prophecy.
Here, the scene of rotten grass turning into fireflies really appeared.
There are three types of fireflies: one is small, flies at night, and has a bright underbelly, which is transformed from grass roots. This is what Lu's "Yue Ling" calls "rotten grass turning into fireflies".
One kind is as long as a maggot candle, with light behind its tail, without wings and unable to 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 root of the grass bamboo can see light at night, sense dampness and heat 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 this 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 a shining brilliance.
"Legend has it that Chang Xi looked at the moon and gave birth to a twelve-month flower."
Dayi began to tell the ancient fairy tale. Xihe and Changxi 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 originally a family. Just like the Yandi family, they are ancient clans left over 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 throughout the world. These two clans have also been responsible for watching over the movements of the sun and the moon, and recording the seasons. Of course, as for the god who originally worshiped the sun and the moon, and welcomed the sun and the moon, I
I once traveled around the mountains and seas, experienced the wilderness in all directions, and 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 perhaps the most well-known later, Chang'e, who was not a 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 personality, 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 to drive the moon, which is the same as Xihe's.