The Mysteries of the Moon


On March 19, we saw a “super Moon” that was bigger, rounder, more golden and more beautiful when the Moon was at its closest position to the Earth. In fact, behind those monumental scenes, the Moon still hides many little-known scientific secrets.

1. There are 4 types of months based on the Moon

One month on Earth is equivalent to one revolution of the Moon. Based on the excavated time calculation tools, archaeologists believe that, in the Paleolithic period, people began to calculate time based on the Moon. However, there are actually 4 different types of months based on the Moon. Those month categories include:

Perigee Month: It is the time it takes the Moon to move one revolution from one perigee to the next. Time is about 27 days 13 hours 18 minutes 37.4 seconds.

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Ascendant Month: The Ascendant month is the average length of time between two successive Moons passing the Ascension. Because of the Sun’s gravity acting on the Moon, its orbit gradually rotates west on its axis, meaning that the intersections also gradually rotate around the Earth. As a result, the time it takes for the Moon to return to the same intersection is shorter than the sidereal month. It is 27 days 5 hours 5 minutes 35.8 seconds long.

Tropic Month: The length of time it takes the Moon to orbit the Earth, based on referencing the Moon’s position to another star. It lasted 27 days 7 hours 43 minutes 11.5 seconds.

Conjunctive month: The average period of the Moon’s motion relative to the Sun. It lasted 29 days 12 hours 44 minutes 2.7 seconds. The synodal month is still the basis of many calendars today.

2. From Earth 59% of the Moon can be seen

Many reference books say that, because when the Moon revolves around the Earth, it also rotates on its axis, so we can never see the entire surface of the Moon but can only look at it. see part. However, we can actually see more than half of the Moon’s surface.

From Earth, we can see up to 59% of the Moon’s surface.
According to the calculations of scientists, the rotation speed of the Moon is fixed, however, the speed it rotates around the Earth is not fixed, so we can see up to 59%. surface of the Moon. The remaining 41%, on Earth, we will never see.

3. The luminosity of the Sun is tens of thousands of times higher than the luminosity of the Moon

At the time of the full moon, the ratio of luminosity between the Moon and the Sun is 1: 398110.

4. The brightness of the high and low moon is only 1/10 of the full moon trăng

If the surface of the Moon is like the surface of a perfect crystal ball, then the luminosity of the Moon’s surface should be the same. In that condition, the brightness of the upper lunar eclipse (7-8 lunar calendar) and the lower lunar eclipse (23-24 lunar calendar) are the same. However, the surface of the Moon is very concave, especially at the boundary between day and night, the surface of the Moon has many mountains, rocks and dust accumulate to create a dark area. Therefore, the brightness of the high moon is only 1/10 of that of the full moon. The midsummer moon is a bit darker than the high waning moon.

5. Brightness of the Illuminated Moon 95% only half of the full moon

The luminosity of the 95% illuminated Moon is only half that of the full moon. Believe it or not, within the 24 hours before the full moon, the Moon’s luminosity is only half that of when the moon is full. completely round. Even if 95% of the Moon’s surface is illuminated, its luminosity is only 7/10 of that of a full moon. However, observing with the naked eye, you will see that they seem to be the same.

6. When observed on the Moon, the Earth also has a change of generals

When observed on the Moon, the Earth also has a change in general. However, this change is in stark contrast to the change of the Moon that we observe from Earth. When we see the new moon, we can also see the round Earth from the Moon.

And when we see the high moon, the Moon will see the crescent-shaped Earth. From any point on the Moon looking down, the Earth appears to have not changed its position in the universe, however, the Earth viewed from the Moon will be 4 times larger than the full Moon we see. The luminosity of the Earth is also 45-100 times higher than that of the full moon.

7. Eclipse from the Moon contrasts with Earth

General as well as eclipses and lunar eclipses on the Moon are opposite to those observed on Earth.

If viewed from the Moon, the contrast is not only the general. When we look at a lunar eclipse, it’s like seeing a solar eclipse in the Sun. At that time, the Earth seemed to cover the Sun.

8. Principles of naming meteor craters on the Moon

Meteor craters on the Moon are formed by collisions with asteroids or comets. They are often named after famous scholars, scientists, artists or explorers in memory of their contributions. For example, the Copernicus Crater is named after the Polish astronomer Nicolaus Copernicus. This custom has been formed since 1645.

9. The temperature difference on the Moon is huge

According to data from the US Aeronautics and Space Administration, the temperature difference in the lunar equator is very large. At night the temperature of this area can drop to minus 173 degrees Celsius, but during the day the temperature can reach 127 degrees. At the craters located at the two poles of the Moon, the temperature is often minus 240 degrees Celsius. During a lunar eclipse, because the Moon moves into the hidden part of the Earth, the surface temperature will be about 90 minutes in about 90 minutes. The moon can drop up to 300 degrees Celsius.

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