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The biggest mirage

The largest mirage was observed in the Arctic at 83°N. and 103°W. Donald B. Macmillan in 1913. This mirage, called Fata Morgana, consisted of images of "hills, valleys, forested peaks spreading 120 ° along the horizon", which 6 years earlier the American explorer R. Peary mistakenly took for the Earth Crocker. On July 17, 1939, a mirage of Mount Spaifells-Jokul (1437 m) in Iceland was observed at sea at a distance of 539-563 km.

auroras

They are caused by discharges of electrically charged solar particles in the upper atmosphere and are most often observed at high latitudes. Auroras can occur at certain times on a cloudless dark night in polar regions within 67° geomagnetic latitude. The upper limit of the auroras passes at an altitude of 1000 km, while the lower limit drops to 72.5 km.

Lowest latitude auroras

The rarest cases of the appearance of auroras at very low latitudes were recorded in Cusco, Peru (August 2, 1744), Honolulu Hawaii (September 1, 1859)

Noctilucent clouds reflect sunlight long after sunset. This is due to the fact that they are at a very high altitude. They are thought to be composed of ice crystals or meteor dust at altitudes of about 85 km.

eclipses

The maximum possible duration of a solar eclipse is 7 minutes. 31 p.

The longest eclipse (7 min 8 s) whose duration has been measured was observed in the Philippines on June 20, 1955. An eclipse with a duration of 7 minutes 29 seconds should occur on July 16, 2186 in the center of the Atlantic. This will be the longest eclipse in 1469 years.

An annular eclipse can last 12 minutes 24 seconds.

The total duration of any lunar eclipse in a year can be 104 minutes.

Most and least frequent eclipses

The largest possible number of eclipses in a year is 7, as was the case in 1935, when there were 5 solar and 2 lunar eclipses. In 1982 there were 4 solar and 3 lunar eclipses.

The minimum possible number of eclipses per year is 2 both solar, as was the case in 1944 and 1969.

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Mobile phones have been proven to be safe for health 19.12.2014

Electromagnetic radiation from mobile phones and power lines does not harm human health, scientists from the University of Manchester say.

The scientists sought to test the hypothesis that the electromagnetic fields of mobile devices cause infertility and cancer, as well as contribute to childhood leukemia. These fields are thought to target vital proteins in the human body. Doctors, just in case, are advised to refrain from long conversations on a mobile phone.

Manchester chemists have studied the effects of a weak magnetic field (WMF) on flavoproteins, proteins that play an important role in controlling the nervous system and repairing DNA. It turned out that the radiation does not affect their functioning.

"Flavoproteins transfer electrons from one place to another. Rapidly decaying structures - radical pairs - often appear along this path. Biochemical reactions with their participation are considered the most likely candidate for damage under the influence of electromagnetic radiation. However, the reaction conditions in the human body are such that the biochemical effect of SMP tends to to zero," said study co-author Alex Jones.

Of course, more research will be required, but this work allows us to state with sufficient certainty that power lines, mobile phones and similar devices are safe for humans, said another author of the article Nigel Scrutton (Nigel Scrutton).

Another study conducted by the British Public Health Protection Agency (an independent public organization whose responsibility is to protect the health of the country's citizens from infectious diseases, poisons and radiation) in 2010 also did not find convincing evidence of the harmful effects of mobile phones, base stations and Wi-Fi on human health. Nevertheless, many organizations are calling for further research, because too little time has passed to understand the long-term effects.

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