-Geography, a textbook for junior middle schools with nine-year compulsory education, Volume I, P 12 (People's Education Press, March 2006 1 version, 200 1), the variation of the sun height and the length of day and night in the area with 40 north latitude.
Obviously, in the area of 40 north latitude, the sun only rises from the due east at the vernal equinox and autumnal equinox, but not at other times. Specifically, the sun rises from east to south during the winter half year from the autumnal equinox to the vernal equinox of the following year; During the summer months from the vernal equinox to the autumnal equinox, the sun rises from the east to the north.
So as far as 40 north latitude is concerned, it is not accurate to say that the sun rises in the east! The sun rises in the east (or southeast or northeast) except the vernal equinox.
Extended data:
The interior of the sun
nuclear reaction area
From the center to 0.25R⊙(R⊙: the radius of the sun) is the real source of great energy from the sun, also known as the nuclear reaction area. Here, the temperature of the sun's core is as high as 654.38+05 million degrees, and the pressure is equivalent to 300 billion atmospheres. At any time, there are four hydrogen fusion reactions going on, forming a helium nucleus.
According to nuclear physics and Einstein's mass-energy conversion equation E=mc2, 600 million tons of hydrogen is converted into 596 million tons of helium by thermonuclear fusion every second, releasing energy equivalent to 4 million tons of hydrogen.
It is this huge energy that brings us light and heat, but the lost mass is nothing compared with the total mass of the sun. According to the current estimation of the hydrogen content in the sun, the normal life of the sun is at least 5 billion years.
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