日食，又作日蚀，是一种天文现象，只在月球运行至太阳与地球之间时发生。这时，对地球上的部分地区来说，月球位于太阳前方，因此来自太阳的部分或全部光线被挡住，因此看起来好像是太阳的一部分或全部消失了。日食只在朔，即月球与太阳呈现合的状态时发生。 日食是相当罕见的现象，在三种日食中较罕见的是全环食，只发生在地球表面与月球本影尖端非常接近的情形下，这时不同地区会出现日偏食、日全食和日环食三种不同的日食，还会出现贝利珠等现象。日全食是一种相当壮丽的自然景象，所以时常吸引许多游客和天文爱好者特地到海外去观赏日全食。例如，在1999年发生在欧洲的日全食，吸引了非常多观光客特地前去观赏，也有旅行社推出专门为这些游客设计的行程。 日食介绍 日食是月球运动到太阳和地球中间，如果三者正好处在一条直线时，月球就会挡住太阳射向地球的光，月球身后的黑影正好落到地球上，这时发生日食现象。在地球上月影里的人们开始看到阳光逐渐减弱，太阳面被圆的黑影遮住，天色转暗，全部遮住时，天空中可以看到最亮的恒星和行星，几分钟后，从月球黑影边缘逐渐露出阳光，开始生光、复圆。由于月球比地球小，只有在月影中的人们才能看到日食。月球把太阳全部挡住时发生日全食，遮住一部分时发生日偏食，遮住太阳中央部分发生日环食。发生日全食的延续时间不超过7分31秒。日环食的最长时间是12分24秒。法国的一位天文学家为了延长观测日全食的时间，他乘坐超音速飞机追赶月亮的影子，使观测时间延长到了74分钟。我国有世界上最古老的日食记录，公元前一千多年已有确切的日食记录。 科学解释 日食、月食是光在天体中沿直线传播的典型例证。月亮运行到太阳和地球中间并不是每次都发生日食，发生日食需要满足两个条件。其一，日食总是发生在朔日(农历初一)。也不是所有朔日必定发生日食，因为月球运行的轨道(白道)和太阳运行的轨道(黄道)并不在一个平面上。白道平面和黄道平面有5°9′的夹角。如果在朔日，太阳和月球都移到白道和黄道的交点附近，太阳离交点处有一定的角度(日食限)，就能发生日食，这是要满足的第二个条件。
An eclipse is an astronomical phenomenon is now a much discussed, the world's first solar eclipse records in where? In fact, the national Chinese records of solar eclipse is the earliest, about October 22, 2137 BC, much earlier than the foreigneclipse records.
The earliest records of solar eclipses, in "Shang Shu Yin Syndrome": "is theseason of autumn moon, Chen Eph in real,...... The blind (blind) played the drums, Sefu Chi, cover people go......." This is a solar eclipse that occurred in the real host position, described at that time there was no people, understanding ofthe laws of nature be confound at eclipse, drum running situation. According to textual research, this eclipse may occur in the Xia Zhong Kang period, about October 22, 2137 bc.
The earliest records of solar eclipse in foreign countries is a total solar eclipseoccurred in Babylon, the time is from 763 BC to June 15th, our country than the earliest records of solar eclipses much later.
An eclipse of the sun, and the sun, is an astronomical phenomenon, only to run to the moon between the sun and earth. Then, on the part of the region on the planet, the moon is located in front of the sun, so from some or all of the sun lightis blocked, therefore seems to be a part of or all of the sun disappeared. This can only in the new age, namely, the moon and the sun appears the occurs. The solar eclipse is uncommon, rare in the three eclipse is total eclipse, only occurson the surface of the earth and the moon Benying tip very close to the case, thenthere will be a partial eclipse of the sun in different areas, a total solar eclipseand eclipse three different solar eclipse, will appear the phenomenon such asBelju. Total solar eclipse is a very magnificent natural scene, so often attractmany tourists and amateur astronomers specifically to go overseas to watch total solar eclipse. For example, in 1999 a total solar eclipse occurred in Europe,attracted a lot of tourists specially to see, there are travel agencies launched specifically for the design of these tourists travel. The solar eclipse on the solar eclipse is the motion of the moon to between the sun and earth, if the three is in a straight line, the moon would block the sun into the light of the earth, the moon'sshadow behind just fall to earth, when a solar eclipse phenomenon. In themoonlight people on the earth are beginning to see the sun gradually weakened,the sun is round their shadows, the sky turned dark, all covered, the sky can see the brightest stars and planets, a few minutes later, from the moon shadow edge gradually reveal the sun, began to light, round. As the moon than the earth is small, only in the shadow of the people to see the solar eclipse. The total eclipse of the sun moon sun blocked, cover a part when the partial eclipse, the centralpart of an annular eclipse occurs from the sun. A total solar eclipse duration of no more than 7 minutes and 31 seconds. The long time the annular eclipse of the sun is 12 minutes and 24 seconds. An astronomer in France in order to extendthe eclipse of the time, he took a supersonic aircraft chasing the shadow of the moon, the observation time was extended to 74 minutes. China has the world's oldest records of solar eclipse, BC one thousand years the exact records of solar eclipse. Scientific explanation of eclipses of the sun and the moon light in theobjects along the typical example of travels in straight lines. The moon is in themiddle of the sun and the earth is not always a solar eclipse, a solar eclipse will need to meet two conditions. First, the solar eclipse always occurs in the first day(lunar calendar). Not all shuori solar eclipse bound, because the orbit of the moon (white) and the sun's orbit (Huang Dao) is not in a plane. The angle between the plane and the plane of the ecliptic confessed 5 degrees 9 '. If in the first day, the sun and the moon are moved to near the intersection road and the ecliptic, the sun has a certain angle from the point of intersection (solar eclipse limit), can be a solar eclipse, which is the second conditions to meet the.
As the moon, the earth's orbit is not a perfect circle, between the day and monthwith the distance of the earth from near and far, so the sun light is the moonobscured form shadow, can be divided into cost, false umbra on earth (the distance of the moon from the earth is far form) and penumbra. The observer in the umbra range can see total solar eclipse; the antumbra range can see the eclipse; while in the penumbra range can only see a partial eclipse of the sun.There are many mountains of the surface of the moon, the moon is not neatedge. Completely cover the sun moon "or light in an instant edge of the arrival of the valley could not, did not cover part to form a light emitting area, like a crystal" diamond "; the surrounding light red aperture formed ring" ring ", the whole, like a mosaic of a bright gem diamond ring, called" diamond ring". Sometimes formingmany special bright light or light spot, like around the sun enchase a string ofpearls, called "Belju" (Bailey is a French astronomer). Whether total or partial eclipse, annular eclipse of the sun, time is very short. To be able to see the eclipse of the area is very limited in the face of the earth, this is because the moon is relatively small, it is relatively small and short of the umbra, the scope and sweep of the umbra on earth is not wide, time is not long, because the average length of the moon Benying (373293 km) less than the average distancebetween the moon and the earth (384400 kilometers), the whole earth, an annular eclipse more than the total solar eclipse. The eclipse eclipse total solar eclipse occurs when the moon, according to the circular surface with the sunround face position relationship can be divided into five kinds of food like: 1 early losses. The moon walk faster than the apparent motion of the sun. Catch the moon solar eclipse time. The eastern edge of the moon just the same sun edgephase "contact" called early losses, is the first "cut", is the beginning of the 2solar eclipse; ". Early losses after about an hour, the eastern edge of the moonand so