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Anonymous users2024-02-11Ancient science and technology are still relatively backward compared with modern times, but the ancients were able to accurately calculate the time of solar and lunar eclipses. This is all thanks to the wise scientists of ancient times, who studied the astronomical calendar and came up with a formula for calculating the time of a solar and lunar eclipse.
Solar and lunar eclipses are now considered to be normal astronomical phenomena, and they are objective facts produced by the laws of nature. However, the ancients did not have the scientific view we have today, and they believed that the appearance of a solar and lunar eclipse was an ominous omen, and that the occurrence of a solar and lunar eclipse would indicate a terrible disaster. In fact, this is also understandable, after all, the ancients did not have a systematic scientific theory to guide the occurrence of natural disasters, so they could only associate some special things with major natural disasters, and special solar and lunar eclipses were the first to bear the brunt.
We all know that solar and lunar eclipses occur due to the blocking of sunlight by rotation and revolution. However, the ancients did not think so, and the earliest ancients put forward the "Yin and Yang Cancellation Theory". In layman's terms, the yin energy emitted by the moon cancels out the yang energy of the sun.
This is obviously unscientific, and during the Eastern Han Dynasty, Wang Chong believed that the solar and lunar eclipses were caused by the periodic changes of yin and yang qi between the two luminous bodies. This doctrine has improved compared to what it was before. Later, Zhang Heng put forward the scientific reasons for the appearance of solar and lunar eclipses in "Lingxian".
With the passage of time, people have become more and more scientific about the appearance of solar and lunar eclipses. Later, through a series of scientific calculations, Liu Hong deduced the intersection of yellow and white, and believed that the intersection angle of the yellow and white intersection was 6 degrees. This further provides a theoretical basis for estimating the time of the occurrence of solar and lunar eclipses.
Until the Tang Dynasty,A scientific analysis of historical solar and lunar eclipses suggests that the yellow-white node moves on the ecliptic for a period of 18 years。And put forward a set of calculation formulas in the "Great Calendar of Evolution".
In the past, when there was no scientific instrument, the ancients were able to calculate the time of the appearance of the solar and lunar eclipses by relying on analysis alone, which makes us sigh at the wisdom of the ancients.
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Anonymous users2024-02-10It is through the observation of the naked eye, and then multiple observations, multiple recordings, so that the simulation of the data comes out.
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Anonymous users2024-02-09Back in ancient times, the Babylonians were based on eclipses.
and lunar eclipses. of long-term statistics, a solar eclipse was found.
and lunar eclipses. There is a cycle of 223 synodic months. This cycle of 223 synodic months is known as the "Saro cycle."
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Anonymous users2024-02-08This magical celestial phenomenon is often foremended, and people can grasp the time of solar and lunar eclipses through some other celestial phenomena, and some animals can also feel a certain change in advance, often giving special warnings.
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Anonymous users2024-02-07Summary. This statement is unscientific. Because you don't need an astronomical telescope to observe a total lunar eclipse. It's not that you can observe what you have, and you can't observe it if you don't have it.
Is it true that astronomical telescopes can observe a total lunar eclipse? Why?
This statement is unscientific. Because you don't need an astronomical telescope to observe a total lunar eclipse. It's not that you can observe what you have, and you can't observe it if you don't have it.
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Anonymous users2024-02-06Many people mistakenly believe that the moon is completely invisible during the total eclipse phase of a lunar eclipse, but this is not the case. For more than an hour from eclipse to light, the Moon is completely within the Earth's umbra, at which point the Earth's atmosphere refracts some of the light onto the Moon's surface. Since the refractive index of the lens is different for different wavelengths of light, the earth's atmosphere, like a lens, has a refractive index to red light that is smaller than that of violet light with a shorter wavelength.
The red light is refracted to the surface of the moon, causing us to appear that the moon has turned red and copper, which is what we usually call the observation method of the "red moon" total lunar eclipse: using binoculars or astronomical telescopes, it can be clearly seen by more than 7 times. You can stand on a high place and look at it, so that the view will be good.
It can also be observed directly with the naked eye, and the following two total lunar eclipses can be observed without any special equipment.
1. Record the whole process of the total lunar eclipse.
Prepare some observation paper before the observation, on which a large circle is drawn, and the circle is marked in a counterclockwise direction from 0° to 360°, and the position of 0° indicates the north point of the lunar surface. During the occurrence of a total lunar eclipse, draw a lunar eclipse sketch every 4 minutes. The result of this is a set of eclipse diagrams of the entire process of a total lunar eclipse.
2. Observe the brightness and color of the lunar surface.
The brightness and color of the lunar surface during a lunar eclipse can be distinguished into the following 5 levels: 0, very dim and almost invisible; Grade 1, slightly brighter, blackish-yellow in color, details indistinguishable; grade 2, slightly bright, black-red or brownish-yellow, with some dark spots in the center, rather bright on the outside; Level 3, brick-red, with visible details of the lunar surface, but very faint; Grade 4, copper-red, very bright, bright on the outside, slightly blue, for large details to see. When observing a total lunar eclipse, it is necessary to make a judgment on the level of brightness and color of the lunar surface and record it.
It is also necessary to record the weather conditions at that time.
Take the group in this paragraph] total lunar eclipse photometric grading.
Danjon total lunar eclipse photometric grading.
l=0 deep black (the moon is almost invisible to the naked eye during eclipses).
l=1 black with gray or brown (difficulty distinguishing details).
l=2 crimson or rusty red (dark black in the center of the umbra but brighter on the periphery).
l=3 brick red (umbra edge shiny or eggless orange with yellow).
l=4 Bright orange-red (bright umbra with blue edges).
Fischer total lunar eclipse photometric grading.
2 The Moon Sea and the main craters are visible to the naked eye, and other details can only be seen with small binoculars (under 4 cm in diameter).
1 A telescope with an aperture of 5cm to 15cm is required to see the details.
0 A telescope of 15cm or more is required to see the details.
These two data are very important, and they need to be written into the report when making official observations of a total lunar eclipse.
I'm an incompetent astronomy fan, so let me explain your problem briefly. The main reasons why telescopes can see distant objects clearly are the following points: light gathering ability, magnification, and resolution. The reason why we see the change of light and shade of the object is mainly determined by the amount of photons entering the optic nerve in the region, so to observe the darker object, this requires a stronger light-gathering ability to enhance the amount of photons in the area, which requires a large-diameter lens (in the lens ignition paper experiment, it can be clearly seen that there are multiple light areas in the sun, the sunlight on the ground outside the lens, the shadow of the lens and the spotlight, you can find that the shadow of the lens is much darker than the sunlight on the ground outside, The spot is much brighter than the sunlight on the ground outside, which means that the lens concentrates the photons on the lens to the ** area, so the unexpected area is darkened due to the decrease in the amount of photons, so that the larger the mirror diameter, the more photons in the ** area, and the greater the energy). >>>More
1. You should know the age and physique of Ling Ai. Children often like to hang binoculars around their necks like the "PLA uncle" in the movie. However, the mirror is too heavy and not good for the child's bone development. >>>More
To give you a simple way to know how many times your telescope actually has, according to what you call magnification, it's actually a close magnification, which means that if your telescope is 20 times, then you can see with a telescope at a distance of 20 meters, which is equivalent to seeing from a distance of 1 meter without a telescope, so according to this logic, you can write a word on a wall that is 1 meter away from you, and the size of the word should be just enough for you to see with the naked eye at a distance of 1 meter Then take your telescope to a place 20 meters away from the wall to see If you can see clearly, then congratulations, your telescope is really 20 times (note: the wall should be very well lit, otherwise unless you have a telescope transparency, otherwise you can only see a cloud of darkness and it is best to use a tripod or find a chair to make the telescope stable, do not hold the telescope in your hand to see, otherwise it will dangle and you can't see clearly) If you can't see the words clearly from a distance of 20 meters, then move slowly until you can read the words clearly Then measure the distance between yourself and the wall, for example, 8 meters, then it means that your telescope is actually 8 times, and now the market sells more than 12 times, and even what 15 to 75 or 100 times the multiple of the telescope is basically a false standard, even the big brands of ** may not be able to guarantee a high magnification of the real standard, like the Yukon River 30*50wa monoculars that I spent more than 400 oceans to buy, the target is 30 times, according to my method, the actual measurement is only 16 times to 18 times, so even so This magnification is already very powerful for a hand-held telescope, 20 meters away, you can see the name on the business card, and of course, this also depends on the strong transmission of this telescope, and if the transmission is not good, you can't see it clearly, no matter how large the magnification is.
The angular diameter of the area of the sky that can be well imaged by the telescope is called the field of view of the telescope or the angle of view of the field of view ( ) The field of view of a telescope is often determined at the time of design. The field of view of a telescope is inversely proportional to magnification, and the greater the magnification, the smaller the field of view. Different optical systems, different imaging qualities (due to aberrations), different apertures, and different focal lengths determine the size of the telescope's different fields of view (in the case of astrophotography, the size of the negatives or CCDs also constrains the size of the field of view). >>>More
The telescope was invented by Hanslippershey from the Netherlands, in 1608. >>>More