New Moon: The Moon and the Sun move to the same side, rise and set with the Sun, and are completely invisible.

Moth Crescent: The Moon and the Sun are at an angle of 45 degrees, the floor height is less than 45 degrees, and it is located in the western sky after sunset, which is the best time to enjoy the new moon and hug the old moon.

With the naked eye, faint reflections on the dark side of the moon (the so-called old moon) can be seen.

Observing with an astronomical telescope, you can see the whole picture of the dangerous sea and the rich sea. The craters of Claumot, Longlinos and Petavise are all worth seeing.

First Quarter Moon: Visible after sunset, at its highest angle, it is the perfect time to observe the Moon's Western Hemisphere.

Through telescope observation, the boundary between light and dark runs from north to south, and a series of famous landscapes: Aristotle and Eudocus craters in the north are very eye-catching, Chenghai and Posidonnis craters below, and the Silent Sea in the middle of the moon. In the southern hemisphere, there are the Liquor Sea and the Theophilus crater, and in the immediate vicinity are dense impact crater areas, the most striking of which is the Maurolikos crater.

Full gibbous moon: Compared to the first quarter moon, the full gibbous moon illuminates a larger and rounder area.

After the sun sets, the waxing gibbous moon hangs in the eastern sky, and the angle gradually increases over time.

Viewed through telescopes, the most beautiful sights at this time include Plato's crater, the Rain Sea and the Archimedes crater in the Alps, as well as the Copernican crater and the Ptolemaic crater in the central part of the country. The sea of clouds in the Southern Hemisphere, the southernmost Tycho crater and the Clavi crater are also landmarks in the Southern Hemisphere.

Then there is the full moon, that is, looking at the moon, that is, Lin Nan went to observe it on vacation last month.

After the full moon, the observation conditions began to improve.

The moon changes from a full moon to a gibbous moon, and the illuminated area of the front side of the moon is constantly decreasing, so it is called a waning gibbous moon.

The northern part of the moon has entered the best observation window, and the Posidonnis crater is at the junction of light and dark. The Aristotelian and Eudocus craters at high latitudes in the northern hemisphere and the Theophilus crater in the southern hemisphere are the best targets for observation.

Last Quarter Moon: Observed through a telescope, the boundary between light and dark runs from north to south, a series of famous landscapes:

In the Alps of the Northern Hemisphere, Plato's crater has the most beautiful light angles. The Alps and the Apennines form a semicircle, hugging the Sea of Rain and the Archimedes Crater. Near the equator are the Ptolemaic crater, the Alphens crater and the Alzach crater. The craters of Clavi and Tycho in the Southern Hemisphere are bathed in sunset sunshine.

Finally, there is the waning moon: through the telescope, the Aristarch crater and the Snake Valley are beautifully illuminated. In addition, there are Hevelius and Grimaldi craters on the east side of the Storm Ocean. The Mason and Sicald craters in the Southern Hemisphere are very three-dimensional.

There are a total of eight moon phases.

And Lin Nan also learned through checking the information that these eight moon phase changes are regular.

In the first half of the lunar calendar, the moon is easily visible after sunset.

The best time to observe at this time is from late afternoon to midnight.

During this half moon, the Moon will change from New New Moon to Full Gibbous Moon to Full Moon.

That is, the moon will gradually become fuller from the crescent moon until it becomes fuller.

In the second half of the month, the moon begins to turn from round to curved, that is, from the full moon to the waning moon.

At this time, the best time to observe it changes to just before sunrise.

That is, the period from late night to sunrise.

Cycle after cycle, cloudy and sunny.

Lin Nan also knew now that just one moon contained so much interesting knowledge.

Previously, he only knew that the moon was at its fullest in the middle of each month, but now he knew the whole change of the moon and the topography of the moon.

Lin Nan truly felt the beauty of the moon and the charm of astronomy.

At the same time, he also learned that the best time to observe the moon in astronomy is the first or last quarter moon, not the full moon that looks beautiful to the naked eye.

It's just that the monthly vacation has passed, and the whole set of equipment for the astronomical telescope is not easy to carry, so it is impossible for Lin Nan to bring it all to the school for practice.

However, the summer vacation is approaching, and Lin Nan is not in a hurry.

So he brought a portable astronomical telescope to the school, and every night he would run to the rooftop of the school building to watch the stars at night.

And the key to the rooftop, Lin Nan also got it smoothly from "Lao Zheng".

Zheng Zemin didn't expect that Lin Nan, a kid, would actually put basketball on and not play, and what he went to do was astronomy.

However, he checked Lin Nan's results on the computer and found that almost all of the science exams in the monthly exams were full scores, so he was silent.

What a freak......

Fortunately, when Zheng Zemin saw that Lin Nan's English was not up to par, he was instantly relieved.

It's not that he doesn't want his students to speak English well, but Zheng Zemin understands that no one can be an all-rounder.

Rather than learning from each other's strengths, it is better to build on their strengths and avoid their weaknesses.

The increasing popularity of Shishuo.com made Zheng Zemin feel that the future society will need more skilled talents.

It is not a person who develops in all aspects but is not proficient in all aspects.

In this way, after Lin Nan studied at night every night, he went to the rooftop alone with an astronomical telescope to gaze at the stars for half an hour, and then went back to the bedroom to sleep.

Day after day, the number of stars and constellations that Lin Nan knew was increasing.

Until the day before the summer vacation.

Lin Nan couldn't help but want to show off to Sidong.

It was an evening self-study, and the students in the class were basically playing with their mobile phones, because tomorrow was a holiday, and everyone had no intention of reading.

Lin Nan glanced at the moon outside the window, and quietly asked Sidong, who was sitting next to him, "Do you know what moon it is today?"

According to Lin Nan's expectations, ordinary people must be surprised that there are many kinds of moons?

Sidong should be no exception.

Then he would be able to reveal his astronomical knowledge to her.

As a result, Si Dong glanced at the moon outside the window and replied, "It's the first quarter moon." ”

Maybe it's because when he arrives in a familiar field, Sidong's voice is much louder than usual.

But Lin Nan didn't find this small detail at the moment, because he actually heard the correct answer of "First Quarter Moon"!

However, Lin Nan quickly thought that Sidong often read books, and it was not surprising that he occasionally saw descriptions of the moon.

So Lin Nan continued to ask: "Then do you know what you can see when you look at the first quarter moon with an astronomical telescope?"

This time, Si Dong didn't look out the window.

At the moment when Lin Nan's question was asked, she replied without hesitation: "You can see Aristotle and Eudocus craters in the north, Chenghai and Percidonnis craters below, Jinghai in the middle, Jiuhai and Theophilus craters in the southern hemisphere, the impact crater area near the surface, and Maurolikos crater." ”

Sidong's words became more and more fluent, and his voice gave people a more and more confident feeling.

People are like this, in areas that they are familiar with and have a certain degree of attainment, they will behave more confidently than usual.

However, Sidong's words stunned Lin Nan.

？？？

How could she answer so "truthfully"!

Who the hell is showing off to whom!

For a moment, Lin Nan's head was full of thoughts, although he didn't know some of the place names in Sidong's words.

But he had no doubt about the correctness of Si Dong's words.

In this way, it is absolutely impossible for Sidong to have just read about the moon in books.

It would be impossible to remember in such detail.

She must have studied astronomy deeply and observed the first quarter moon many times, so she could blurt it out.

Lin Nan had a feeling of being deflated.

I wanted to show off my astronomical knowledge in front of Sidong, but I was hit by her!

But how could Lin Nan admit defeat just like that?

After thinking about it, Lin Nan looked at Si Dong with a confident face, and finally asked a question that he didn't know either: "Then do you know how to shoot the moon the most beautifully?"

As soon as the words came out, this time Si Dong did not answer quickly, but frowned slightly.

Lin Nan saw it in his eyes and thought: You don't know now!

But I don't know that Si Dong is organizing language in his mind.

After a while, a longer paragraph than just now came from Si Dong's mouth:

"First of all, it's best to choose the first or last quarter moon as the subject, because the moon is more detailed and has a moderate amount of luminosity.

Then shoot in a place with low light pollution in cloudless weather, such as the top of a mountain or an uninhabited wilderness.

Next, choose an astronomical camera instead of a DSLR camera and use the astronomical camera to take a video of the first quarter moon.

Because atmospheric shake can be good and bad, if you shoot with a camera, atmospheric shake will have a big impact on the quality of the photo.

The astronomical camera is different, after the video is taken, the video overlay technology can be used to automatically rely on the software algorithm to retain those clear frames with slight shaking, and eliminate those blurry frames with severe atmospheric shaking.

These clear frames are then superimposed together by a mathematical algorithm to form a single image.

This single image will have all the detail of a sharp frame, and it will also smooth out the random noise on the image through a means algorithm.

Finally, you can also use software to sharpen the photo and stitch it with the mosaic to make the photo clearer and more detailed.

Of course, if you want to photograph the most beautiful moon, you must use the best astronomical telescope.

For example, the high-magnification telescopes used in the observatory, or in the astronomers.

But that kind of ordinary astronomy enthusiast can't reach either. ”

Sidong, who had never said such a long sentence, felt dry in his throat after finishing speaking.

He picked up the water cup on the table and took a few sips of water.

On the other side, Lin Nan was already down......

Astronomical camera instead of DSLR camera, atmospheric jitter, video overlay technology, software automatic algorithm, sharpening technology, mosaic stitching?

......

What is this?

......

It took a while for Lin Nan to recover from this series of terms that dazzled him.

In fact, when he first came into contact with astronomy, Lin Nan read everything on the Internet.

At that time, I also saw some of the things that Si Dong had just mentioned.

However, after Lin Nan decided to start from the basics, he had not been exposed to these advanced techniques.

And now he completely understands that Si Dong is definitely a veteran astronomy enthusiast.

And it must be the daughter of a senior in their Lingnan local starry sky group.

Thinking of this, Lin Nan smiled happily again.

Because of Sidong's story, he thought of doing charity and the Million Club program.

And now the second item of his Million Club is astronomy, and Sidong actually has a deep attainment in this area.

He and her are really fated!

Looking at Sidong's innocent face, Lin Nan knew that she didn't want to show off her astronomical knowledge in front of her just now.

But boys at this age are always unyielding.

Lin Nan told Si Dong about his "Million Club" plan.

After hearing this, Sidong's face was full of shock.

Especially when she learned that Lin Nan had used the one million she earned from basketball to build a building.

She looked at Lin Nan's eyes full of respect, admiration, and a trace of admiration that couldn't be hidden.

Lin Nan looked at Si Dong's eyes looking at him, and then he regained his former self-confidence.

He felt Si Dong's admiration for himself from his eyes, but completely ignored the hazy feelings between adolescent men and women.

Lin Nan just stared at Sidong with wide eyes.

In the end, it was Si Dong's face that first appeared a touch of crimson, and he came back to his senses and asked Lin Nan: "But, as far as I know, astrophotography has always been a hobby that makes ends meet, how can you earn a million?"

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