- Tram Ho
As one of the most interesting astronomical phenomena that humans can track directly, a solar eclipse occurs when the Moon partially or completely obscures the Sun. This happens when the Sun, Moon, and Earth are in a straight or near straight line, and the Moon passes between the Sun and the Earth.
Based on the shadow regions of the Moon on the Earth’s surface, a total of four types of eclipses are classified. With total eclipse, the Sun disk is completely obscured. Meanwhile, with partial eclipse, annular eclipse, hybrid eclipse, the Sun is only partially obscured.
Partial eclipse, total eclipse and annular eclipse
Notably, this afternoon (June 21, 2020), Vietnam is one of the countries and territories that have the opportunity to observe a partial eclipse.
It is expected that a partial solar eclipse in Vietnam will begin at about 13h this afternoon, counting from the time the Moon began to cover the Sun, lasting continuously for 3 hours. All provinces in Vietnam have the opportunity to monitor a partial eclipse. However, astronomy enthusiasts in the northern provinces will be able to observe partial eclipses with a larger percentage of coverage than the southern provinces.
According to the Hanoi Amateur Astronomical Association (HAS), the highest percentage of solar cover in Ha Giang is 79%, while the lowest one in Ca Mau (27%).
In Hanoi, partial solar eclipse will begin at 13:16, peaking at 14h55 with a coverage rate of 71%, ending at 16:18. In Da Nang, partial eclipses begin at 13:30, reaching a peak at 15h04 with a coverage rate of 56%. In Ho Chi Minh City, the eclipse begins at 13h37, reaching its maximum at 15:05 with the cover rate of only 36%, ending at 16:18.
Northern provinces will have the opportunity to monitor eclipses with high coverage
It is known that there will be 3 eclipses in the southern provinces in the next 10 years. However, with the Northern provinces, it is not until 2031 that people will have the opportunity to witness the eclipse phenomenon again with a high coverage rate. Therefore, astronomical lovers in these areas should not miss the opportunity to witness the amazing phenomenon that happens once in a while.
How to observe eclipse safe
During the solar eclipse, viewers should be very careful not to observe directly with the naked eye or sunglasses, because the sun’s radiation can affect the eyes directly. When observing an eclipse, viewers need to prepare a light filter for the eyes or a specialized filter layer (sun filter) if observing with a telescope.
In addition to buying specialized filters, filters, you can also use the method of mixing ink pots. First, we mix the black ink into a pot of water, place it under the ground to catch the image of the Sun in the basin. You can also use a sheet of glass to increase the reflection. The ink phase must ensure the black level so that there is no glare and clear images are obtained.
Viewers need to be very careful not to observe directly with the naked eye, but must use specialized glasses
Viewers can also observe the solar eclipse indirectly by placing a cover with a small hole in front of binoculars, a telescope (or making a carton box by carton), then projecting the image of the Sun on a piece of paper white. In particular, you can also watch the eclipse through the welder’s glasses type 14 or higher, or through the computer floppy disk without scratches (2 or 3 layers can be used relatively safe but for image quality is not well done).
Source : Genk