A total solar eclipse is coming soon, how should we take advantage of it?
2009 Total Solar Eclipse in China? On July 22, 2009, there will be a total solar eclipse of the century! The total solar eclipse lasts up to 6 minutes and 38 seconds. The total solar eclipse belt stretches from India across China to the Pacific Ocean, and will pass through the densely populated Yangtze River Basin. A total solar eclipse lasting 4-5 minutes can also be observed in China. The total solar eclipse lasts so long that astronomers regard it as a must-see total solar eclipse.
.?Total solar eclipse information:
Date: July 22, 2009
Main observation locations: India, Nepal, Bhutan, Bangladesh, China , a small island in the south of Japan
The time when the umbra touches the ground (U1):?HKT?08:51:16.8(am)
The time when the umbra leaves the ground (U4):?HKT ?12:19:26.5(pm)
Maximum eclipse point: ?Lat?=?24°12.6'N, Long,?=144°06.4'E?(Pacific Ocean)
< p>The longest solar eclipse duration:? 6 minutes and 38.8 seconds? (Note: The duration of the solar eclipse is different in different locations)Solar eclipse situations in major cities
China Overseas total solar eclipse path map, the total solar eclipse belt passes through many major cities in China, such as Shanghai, Suzhou and Hangzhou, Hefei, Wuhan, Chongqing, Chengdu, etc. Partial solar eclipses of varying degrees can be seen in other parts of the country.
City Initial loss, initial loss, high eclipse, already eaten, even eaten, very high, reborn, full circle, eclipse extended (duration of total solar eclipse)
Yaan Yaan 8:06 21 9:09:08 9:11 :23 35 9:13:39 10:25 4 minutes and 31 seconds
Leshan Leshan 8:06 21 9:09:36 9:11:57 36 9:14:19 10:26 4 minutes and 43 seconds Seconds
Zigong 8:07 22 9:10:58 9:13:03 37 9:15:10 10:28 4 minutes and 12 seconds
Chengdu 8:07 22 9:11:11 9:12:48 36 9:14:26 10:26 3 minutes and 16 seconds
Neijiang Neijiang 8:07 23 9:11:11 9:13:27 37 9:15 :44 10:28 4 minutes and 33 seconds
Suining 8:08 23 9:12:14 9:14:28 38 9:16:43 10:29 4 minutes and 29 seconds
< p>Nanchong Nanchong 8:08 24 9:13:15 9:15:12 38 9:17:09 10:30 3 minutes and 54 secondsChongqing Chongqing 8:08 24 9:13:16 9 :15:19 39 9:17:22 10:31 4 minutes and 6 seconds
Fuling Fuling 8:09 25 9:14:13 9:16:21 40 9:18:30 10:21 4 Minutes 16 seconds
Wanzhou Wanxian 8:10 26 9:15:50 9:18:08 41 9:20:26 10:34 4 minutes 36 seconds
Dazhou Daxian 8: 10 26 9:16:12 9:17:11 40 9:18:10 10:33 1 minute 58 seconds
Enshi 8:10 27 9:16:39 9:19:12 42 9 :21:45 10:36 5 minutes and 5 seconds
Yichang Yichang 8:12 29 9:19:29 9:22:07 44 9:24:46 10:40 5 minutes and 17 seconds
Jinshi 8:12 30 9:21:47 9:22:42 45 9:23:38 10:41 1 minute 51 seconds
Shashi 8:13 30 9:20 :55 9:23:26 45 9:25:57 10:42 5 minutes and 2 seconds
Jingmen 8:13 30 9:20:56 9:23:29 45 9:26:03 10 :42 5 minutes and 8 seconds
XiaoganXiaogan 8:15 32 9:23:27 9:26:09 47 9:28:52 10:45 5 minutes and 24 seconds
Suizhou Suixian 8:15 32 9:24:06 9:25:27 47 9:26:49 10:44 2 minutes and 43 seconds
Wuhan 8:15 32 9:24:00 9:26: 42 48 9:29:25 10:46 5 minutes and 25 seconds
Xianning 8:15 32 9:24:59 9:26:34 48 9:28:09 10:46 3 minutes and 10 seconds
Huangshi Huangshi 8:15 33 9:25:36 9:27:56 49 9:30:17 10:48 4 minutes and 42 seconds
Tongcheng Tongcheng 8:18 35 9:28:27 9:31:12 51 9:33:58 10:52 5 minutes and 32 seconds
Anqing 8:18 35 9:28:34 9:31:17 51 9:34 :01 10:52 5 minutes and 27 seconds
Lu'an 8:18 35 9:28:58 9:30:32 50 9:32:07 10:51 3 minutes and 8 seconds
Tongling 8:19 36 9:29:45 9:32:35 52 9:35:26 10:53 5 minutes and 41 seconds
Hefei Hefei 8:19 36 9:30 :50 9:31:50 51 9:32:51 10:52 2 minutes and 0 seconds
Chaohu Chaoxian 8:19 36 9:30:50 9:32:48 52 9:34:48 10 :53 3 minutes and 58 seconds
Wuhu Wuhu 8:20 37 9:31:12 9:33:37 53 9:36:08 10:55 4 minutes and 57 seconds
Anji Anji 8:21 38 9:33:07 9:36:00 54 9:38:54 10:58 5 minutes and 47 seconds
Hangzhou 8:21 39 9:34:17 9:36: 56 55 9:39:36 10:59 5 minutes and 19 seconds
Huzhou 8:22 39 9:33:54 9:36:47 55 9:39:41 10:59 5 minutes and 47 seconds
Suzhou 8:22 39 9:35:16 9:37:43 55 9:40:11 11:00 4 minutes and 55 seconds
Wuxi 8:22 39 9 :35:18 9:37:07 55 9:38:58 10:59 3 minutes and 40 seconds
Changzhou Changzhou 8:22 39 9:35:30 9:36:29 55 9:37: 29 10:58 1 minute and 59 seconds
Jiaxing 8:22 40 9:35:04 9:38:00 56 9:40:56 11:00 5 minutes and 51 seconds
Yuyao Yuyao 8:23 40 9:36:20 9:38:51 56 9:41:22 11:02 5 minutes and 2 seconds
Changshu 8:23 40 9:36:27 9: 37:57 56 9:39:27 11:00 3 minutes and 0 seconds
Shanghai 8:23 40 9:36:48 9:39:18 57 9:41:49 11:02 5 minutes 0 seconds Ningbo Ningbo 8:23 40 9:37:23 9:39:33 57 9:41:44 11:03 4 minutes 21 seconds
*The above table uses China time (U.T.+8), All in the morning
**Due to rounding, the food delay may not be equal to the light generation time minus the food time.
***The eclipse delays at different locations in the same city can differ by tens of seconds
Observation method?
Warning: Do not look at the sun directly with the naked eye , and do not observe the sun through a finder, binoculars or astronomical telescope without a proper filter in front of the mirror, otherwise you may be blinded!
In addition to visible light, the sun also emits quite strong infrared (infrared) and ultraviolet (ultraviolet) rays. Excessive amounts of both can damage vision. Unfortunately, the cones and rods in our retina cannot sense infrared and ultraviolet rays. Some can only effectively filter visible light and can give you a "dark" enough feeling, but may not be safe.
1.?Sun filter glasses?/?Solar filter
A qualified piece of filter paper should be able to filter at least 99.9997% of light.
To ensure safety, please check whether the glasses/filters are damaged before each observation. It is recommended to check whether the filter paper is "Suitable for Direct Gazing into the Sun" or "Safe?for?Direct?Solar?Viewing" before purchasing the relevant filter paper. ” and other words. If in doubt, do not use.
Projection method
Use a telescope (refracting telescope is best) to project the image of the sun on a white paper, and then watch the image on the white paper. This method is safe and can be viewed by multiple people at the same time, but the contrast of the solar image is low.
Mirror filter method
Install a specially designed solar filter in front of the telescope mirror to reduce the luminosity of the sun. The filter must filter out 99.9997% of sunlight to be considered suitable.
Note: Some solar filters installed at the eyepiece end may suddenly break due to overheating due to receiving focused sunlight, so they are not recommended.
There is another type of filter paper that is only suitable for photography and should not be installed on a telescope for direct observation.
The Fun of Eclipse
Some?people?see?a?partial?eclipse?and?wonder?why?others?talk?so?much?about?a?total? eclipse.
Seeing?a?partial?eclipse?and?saying?that?you?have?seen?an?eclipse?is?like?standing?outside?an
opera ?house?and?saying?that?you?have?seen?the?opera;?in?both?cases,?you?have?missed?the
main?event.?
-Jay? M.? Pasachoff (1983)
First Contact
First contact marks the beginning of a solar eclipse. The sun appears from the west, and the gap slowly Increases in size and gradually becomes crescent-shaped. The crescent-shaped pinhole sun can also be seen under the tree.
Shadow Bands
A few minutes before eating, you have the opportunity to see shadow bands of alternating light and dark, just like watching ripples in water. If it is covered with white cloth, it will be more obvious.
Baily's Beads
About ten seconds before the eclipse, the moon nearly covers the entire sun, and only a ray of sunlight can penetrate through the valley on one side of the moon, which is called Belize bead phenomenon. Diamond Ring
When only one bead is left, a diamond ring is formed.
Chromosphere
The sunlight we usually see mainly comes from the photosphere. This intense light obscures the darker chromosphere above it.
A few seconds after the eclipse, when the moon blocks the photosphere below, the purple-red chromosphere appears briefly. Corona
The corona is the outermost atmosphere of the sun and can extend outward to several solar halves. What's special is that the shape of the corona varies during each total solar eclipse, which may be related to the solar activity cycle.
Finally, I wish you can watch the total solar eclipse. I am so miserable because it cannot be seen in Hong Kong this time...