The phenomenon of the sun and the moon shining together was actually a symbol of auspiciousness in ancient times. It was considered an auspicious sign, indicating that good things would happen. So everyone knows how often the phenomenon of the sun and the moon shining at the same time occurs on average. ? Then let us use the knowledge of constellations to reveal the answer to you! Let’s take a look!
How often does the phenomenon of the sun and the moon shine together occur on average almost twice every month (lunar calendar), one in the afternoon of the first half of the month and one in the morning of the second half of the month.
Principle of the sun and the moon shining at the same time The sun and the moon shining at the same time is just a natural phenomenon. The phenomenon of the sun and the moon shining at the same time requires the sun and the moon to be above the horizon at the same time. Theoretically, as long as the atmospheric conditions are relatively good, this phenomenon may occur except on the fifteenth day of the lunar calendar. But there is a second condition, which is that the limit magnitude of the sky (the dimmest celestial object that can be seen) cannot be too low, so generally speaking, when the sun is rising or about to set, the brightness of the sky can easily meet this condition (even if is a city). Therefore, in the first half of the lunar calendar (after the fourth day of the lunar month), you can see the moon phases when the sun sets, in sequence from the west to the east. In the second half of the lunar calendar (before the 27th), you can also see the moon after the sun rises, in sequence from the west sky to the eastern sky.
What does the sun and the moon shine together symbolize? In some stories, the sun and the moon shine together represent the emergence of evenly matched people or forces. But in fact, under the real environment in ancient times, the sun and moon shining together was a good omen. Zhou Gong interpreted the dream and said that "sun and moon" are "bright", which indicates "good luck". In ancient times, some people made Duan inkstones out of this stone, implying a bright future and advancement.
Extended information If you keep observing and thinking carefully, you can also find that the moon and the sun can actually appear in the sky at the same time every day, but the duration of the "sun and moon shining together" will vary. On some days it is only a few minutes, while on some days it can last for hours, and the two time periods that are easily observed happen to be the latter, so the possibility of being seen is greater. . The duration of the "sun and moon glow" on different days should be calculated based on the movement patterns of the moon and the sun in the sky. "The sun and the moon shine at the same time" must mean that the closer the moon and the sun are, the longer they last (equivalent to rising and setting together). However, when the moon is too close to the sun, it will be submerged in the dazzling sunlight and cannot be observed. .
The parameters used in the calculation are as follows: a=29.5/360°=0.0819/1° - the lunar age corresponding to the unit distance angle between the moon and the sun ω=360°/24h=15°/ h——The speed of the moon and the sun in the sky (ignoring the revolution of the earth and the moon). Now assuming that the age of the moon is x (for example, on the eighth day of the lunar month, x=8), we can get the following conclusion: φ=x /a——The distance angle between the moon and the sun t=(π-φ)/ω——This is the duration of "the sun and the moon shine together" can be calculated through the above equation, before and after the eighth day of the lunar month (that is, the first quarter) In a few days, the "sun and moon shine at the same time" can last for five or six hours, which means that this phenomenon can be seen five or six hours before the sun sets in the west.
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