World prepares for the annular solar eclipse

Astronomy-lovers will have the opportunity to watch the annular solar eclipse early next week and this is striking astronomical phenomenon of the year. In Vietnam, people can observe the phenomenon of partial solar eclipse.
Nguyen Duc Ward, Astronomical Society of the Universe Vietnam, said annular solar eclipse occurred on 21/5. The area where people observe this phenomenon is a narrow band width from 240 to 300 km, extending from the east coast of southern China to Japan, the Pacific and the western end United States.


Points can be observed the eclipse maximum is situated on the Pacific Ocean. Vietnam, although not in the annular eclipse, but people can still observe a solar eclipse phenomenon if favorable weather conditions during nearly an hour after sunrise.
Explaining this phenomenon, Dang Duy Tuan, head of the astronomy club amateur HCM City, said that Vietnam eclipse only partly due to our area only in the penumbra of the moon shadow . Also this process should take place at dawn in Vietnam observers will observe the following stages of the phenomenon.
Partial solar eclipse began 3h56 hourly Vietnam, and the annular phase begins at 5h06. Time for Vietnam to observe a solar eclipse when the sun rises around 5:30 5h17 in Hanoi and in Ho Chi Minh City; and ends around 6h01 6h13 in Hanoi and in Ho Chi Minh City as the sun rising about 10-12 degrees .Comparison between total solar eclipse (left) and annular solar eclipse (right). If standing in the dark (a), assume the dark (b) and half dark shadows (c) will observe a total eclipse, respectively, and an annular portion. Graphics: HAAC.
Experts recommend that the observer in Vietnam should take advantage of opportunities once the next annular solar eclipse. By 09/03/2016 to have new people in Vietnam can observe the phenomenon again. According to Ward, the eclipse occurred at dawn so the observer will see the red sun of fire and quite subdued, largely due to light absorbed by the atmosphere.
In addition, because visual illusion to fool the viewer will see the sun when it is larger than in the crown. Therefore, even in moments when the sun is sweet and light, we can see the eclipse with the naked eye. But then the viewer to use special filters, or other traditional methods of observation to observe a solar eclipse. The reason for this light intensity of the sun was quite strong so the retina can be damaged.
The eclipse occurs when the moon passing between Earth and sun. Annular eclipse occurs when the Earth every year in the position closest to the sun and moon in the most remote locations over the globe. Therefore the moon is not large enough to obscure the sun and two whole penumbra created by the moon will open wider than the total eclipse, and overlap to form a region called the dark authors. Residents of areas on earth with the darkness of this fake scan will observe the annular solar eclipse, the penumbra will also observe a solar eclipse.
The eclipse observing safety
Direct observation: Do not use the video light is not filtered for astronomical purposes, such as X-ray films, videotapes, they smoke glass, gift wrap etc. ... to observe, these categories can filter the light but we can not filter the infrared and ultraviolet will hurt your eyes.
Absolutely not observed through telescopes, binoculars, if not mounted dedicated solar filter film. It is not allowed to use the sunglasses to observe the eclipse.
Telescopes and binoculars to block the sun filtering film at the dedicated lens can be used to observe the eclipse.
Observed indirectly by the phase method using ink pots: Use black ink and water bowls phase solar observations in the bowl picture, can use a mirror to increase the reflectivity. Phase to ensure the ink black to look no glare.
Observed indirectly by observation through screens: Make a small hole about 1 mm on a sheet of cardboard or a piece of tin, through the sunshine and watch the sun's image through the hole on a plate white paper placed below.