Suppose that one day, people on the earth sleep for n days and wake up without knowing what day it i

Looking at the comet's position, how much it has changed, and dividing it by the average rate of the comet's orbit will give you an idea of how many days have passed, and the advantage is that if n is greater than 365 days (sleeping dead), then this method is more accurate.

Even the ancients could have known what day you woke up when you said that in this case.

The ancients had reached such an advanced level of observation of celestial phenomena that they could even calculate when a solar eclipse would occur. When they wake up, they only need to look at the starry sky with the help of their celestial instruments, especially the position of the sun, moon or planets, and then they can work backwards back to what day it was.

Of course, you can, just look at the fission of radioactive elements, it's very simple. You probably don't understand. For those who understand engineering and science, there is another way to check the life span of the sun, and the other is to look at the redshift phenomenon of the rays of the sky. and many other methods.

What they say is too complicated, in fact, the ancients had a strong study of celestial phenomena.

As you said, the ancients could roughly estimate the months based on the temperature of the weather.

In addition, you can also estimate the approximate solar terms, and the waxing and waning of the moon at night can clearly know what day it is, but it is still a little difficult for us ordinary people to practice this ability.

Judging time is based on the changes of reference objects, such as ancient hourglasses and drippings, such as modern clocks and calendars, astronomical sun, moon and stars, and subtle such as the attenuation of elements. There are also changes in various other creatures.,Like flowers blooming and falling.,The tide rises and falls.,I want to find it all the way back.。。。 You can also observe a woman's menstrual cycle.

Haha, it's a joke, but you can always see the full moon and the moon wanes, and the ancient Chinese were good at this!

Turn on your phone and take a look, or look at your computer. It's okay to ask someone.

Change three, they are going to transport their planet to Earth, and finally o.

There is a lower in 2499.

Just kidding, let's get to the point, in fact, I really don't know how much it can produce, you can estimate how much you produce, and then multiply it by the number of people in the world, and then there are elephants, hippos, birds, .........In terms of conservation of energy, energy neither disappears nor is generated for no reason, but is simply transferred from one object to another. All the manure is a waste that I can use up, but not for plants, because they are different from what we need. It can absorb nitrogen from feces, and of course many microorganisms can also decompose, but in the end it is still used by plants!

Then the animals eat the plants again. Follow-up:

Flows into the river, and there are not trees next to the river! The tree ate it! Then, the farmer took the water from the river to water the vegetables, and the vegetables were eaten, and then the vegetables were eaten by you again!

The last Saturday of March, this year it is March 26.

On the last Saturday of March every year.

Earth Hour is an initiative of the World Wide Society for Nature (WWF) to address global climate change, hoping that individuals, communities, businesses and individuals will turn off their lights for an hour on the last Saturday of March from 20:30 to 21:30 to show their support for climate change action.

On the last Saturday of March every year.

This year is Saturday the 26th. Starts at 8:30 p.m. An hour

Every year on the last Saturday of March.

Earth Hour is an initiative issued by the World Nature** (WWF) to the world, which will send a positive signal to the world**, enterprises and individuals through the action of turning off the lights for an hour, calling on everyone to make positive changes to combat climate change. "On March 28, 2009, starting from Fiji, Australia, Japan, Singapore, China, Indonesia and other Asian cities will be the first to turn off the lights, and cities in Europe and the Americas will follow," said Ou Dameng, chief representative of WWF (China), told reporters that 74 cities from 62 countries and regions have committed to participate in the "Earth Hour" activity, and the activity is being actively promoted in Beijing and Shanghai. "As ordinary individuals, we can use this hour to have a candlelit dinner with our families, the building staff can turn off the neon lights, as the mayor can encourage citizens to participate, and everyone can contribute to a low-carbon economy," said Odamon.

As a global public welfare action, "Earth Hour" attracted the participation of public figures such as Yang Lan, Lang Lang, Li Bingbing, and Ma Weidu. At the launch ceremony, Ma Weidu expressed his full support for the event, and called on local governments to participate by encouraging local citizens, businesses and turning off the landscape lights of landmark buildings, and that the actions of companies can also influence the actions of employees and customers, and that schools and other communities can raise awareness of climate change through "Earth Hour" related activities that are fun and educational.

Earth Hour, a campaign dedicated to raising public awareness of environmental protection, was first launched in Sydney in 2007 and was attended by 2.2 million people that year. In 2008. More than 50 million people in 70 cities and regions in 35 countries around the world participated in the event, and the facades of iconic buildings such as the Sydney Opera House, the Golden Gate Bridge in San Francisco, and the Guildhall in London were also extinguished.

In 2009, Earth Hour aims to involve about 1 billion people in 1,000 cities around the world.

From 8:30 to 9:30 on the 27th, the lights of colleges and universities in Dalian were turned off yesterday, believe me!

Every year on the last Saturday of March. This year, it is.

It is 29 days, 13 hours, and 34 minutes.

1 day = 60 points * 24 = 1440 points.

42574 1440 = 814 points remaining in 29 days.

814 60 = 13 hours and 34 minutes.

29 days, 13 hours, 36 minutes, and one rotation is the same time.

The earth has just formed, the temperature is extremely high, there are thousands of degrees on the surface, there are volcanic eruptions everywhere, the ground is full of magma, there is lightning in the air, there is only methane, hydrogen and other gases in the air on the earth at that time, there is no oxygen, and then the temperature of the earth slowly drops, the frequency of volcanic eruptions becomes smaller, and after the temperature drops, the water vapor in the atmosphere liquefies into water and falls to the ground, forming a primordial ocean. Now there's the question of the origin of life on Earth.

Scientists believe that if the Earth is allowed to move freely, it may exist forever, but if other external factors interfere with it, the Earth may have an end of life.

The external factor is the sun in the first place, because it is the closest planet to the earth and can have a destiny on the right earth That is to say, all the energy and power on the earth come from the sun, and once the sun has three long and two short, it is bound to affect the earth. Before the 30s of this century, people always thought that the sun would one day burn out, turn from white to orange and then to red, and finally become a dark star that was silent, but its brilliant life. In the 30s, when physicists learned the mystery of the sun's light, the situation was very different.

It turns out that the Sun's energy comes from its thermonuclear reactions, and the Sun's lifetime will pass through the gravitational contraction phase, the main-sequence star phase, the red giant phase, and the compact star phase. The main sequence phase is the period of stability of the Sun. This phase will last for 10 billion years.

At present, the sun is only halfway through and is in middle age. Once the Sun reaches the red giant stage, then the end of the Earth is coming. Of course, this is billions of years away.

Are there any other factors besides the sun's interference with the earth? Some scientists believe that the Sun may have a brother, a companion star of the Sun, which orbits the Sun day and night, and turns to the closest place to the Sun every 26 million years"Make waves"Its strong gravitational pull will cause a large disturbance of many comets, and 1 billion comets will be on a rampage in the solar system, and the Earth and other planets will become these comets"Target"。If the mass of the comet that collides with the Earth is large enough, the consequences are unimaginable:

the extinction of light organisms and the drastic changes in ecology; Heavy landslides and earth cracks, the earth"Broken bones"。However, this solar companion star, which could bring misfortune to Earth, has not been discovered, although many scientists believe it exists.

Every year on the last Saturday of March. 20：30-21：30；In an ordinary day, an ordinary hour, we can use our practical actions to do something to protect Mother Earth.

Earth Hour is a global public welfare initiative proposed by the World Wide Society for Nature (WWF) in response to global climate change, hoping to turn off the lights for one hour from 20:30 to 21:30 on the last Saturday of March every year to show the support of human action on climate change.

Every year on the last Saturday night of March from 20:30 to 21:30 is the lights out day, on this day, of course, you can usually turn off the lights for environmental protection.

Earth Lights Out Day is March 26 from 20:30 to 21:30 on the evening, of course, you can turn off the lights more often for environmental protection.