LIMAPAGI – At the end of January 2022, the Indonesian sky will be decorated a number astronomical phenomenon. One of the most interesting is the Black Moon.
So what is Black Moon?
Researcher from the BRIN Space Research Center, Andi Pangerang, said that there are actually several different definitions of the Black Moon.
For a full explanation, here is as quoted from Edusainsa LAPAN, Friday, January 28, 2022.
1. The second phase of the new moon in one AD
The first explanation of the Black Moon is the second new moon phase in the month of AD. This phenomenon occurs quite often because it takes place periodically with a period of 29 months.
This phenomenon occurs because the age of the Gregorian month other than February (30 and 31) is longer than the duration of the synodic cycle of the month (also known as full moon, which is 29.53 days) and the first new moon in the Christian month falls at the beginning of the month, so the second new moon falls. at the end of the Christian month.
2. The third new moon phase in an astronomical season
This phenomenon occurs every 33 months, due to the longer duration of the astronomical season (89 and 93 days) compared to the first to fourth new moon interval (3 x 29.53 = 88.6 days).
In addition, the first new moon in the astronomical season falls at the beginning of the season so the fourth new moon falls at the end of the season.
3. There is no new moon phase in February
This is because February in a Basit year is 28 days old. This is shorter than the duration of the month’s synodic cycle or also known as Lunas, which is 29.53 days.
This phenomenon occurs once every 19 years, according to the methonic cycle when the new moon phase coincides with the same Gregorian date.
4. There is no full moon phase in February
The age of February in a Basit year is 28 days and in a Leap year 29 days, this is still shorter than the duration of the synodic cycle of the month or full moon which is 29.53 days.
Therefore, this phenomenon occurs once every 19 years, according to the methonic cycle when the phase full moon coincides with the same AD date.
Also Read: EIGHT explanations of the Astronomical Phenomenon Apoge Mars
Black Moon Phenomenon Time
The Black Moon phenomenon occurs at different times. The Black Moon at the end of January occurs in the United States, while Indonesia will experience it at the end of May.
This time difference is due to the different time zones in each place. The fall of the new moon phase for each full moon is also different. So, there are regions that experience Triple, Double, and once-only Black Moons.
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