Which month was the leap month in 1963?
In the year 1963 AD, it was a common year with 365 days, totaling 53 weeks. It was the lunar calendar's Gui Mao year (Rabbit year), and had a leap April, totaling 384 days.
There was indeed a leap April in 1963.
In the lunar calendar, there is no term for the thirteenth month. According to the rules of the calendar, the leap month is placed after the months from February to October, repeating the same month. The repeated month is called the leap month, for example, the leap month after April is called the leap April.
In the period around the 21st century, the leap April is a common leap month, generally occurring every 8 or 11 years, and once every 38 years at most. Its frequency is second only to the leap May. However, the pattern is not fixed and changes over time, with the frequency of the leap April gradually decreasing as time moves forward.
There was indeed a leap April in 1963.
In the lunar calendar, there is no term for the thirteenth month. According to the rules of the calendar, the leap month is placed after the months from February to October, repeating the same month. The repeated month is called the leap month, for example, the leap month after April is called the leap April.
In the period around the 21st century, the leap April is a common leap month, generally occurring every 8 or 11 years, and once every 38 years at most. Its frequency is second only to the leap May. However, the pattern is not fixed and changes over time, with the frequency of the leap April gradually decreasing as time moves forward.
What is the reason for the occurrence of the leap month?
Ancient laborers referred to the first set of solar terms (Start of Spring, Awakening of Insects, Clear and Bright, Grain Full, Grain in Ear, Slight Heat, Start of Autumn, White Dew, Cold Dew, Start of Winter, Heavy Snow, and Minor Cold) as "solar terms"; while the second set of solar terms (Rain Water, Vernal Equinox, Grain Rain, Grain Buds, Summer Solstice, Great Heat, Limit of Heat, Autumnal Equinox, Frost's Descent, Light Snow, Winter Solstice, and Great Cold) were called "mid-term".
The average interval between two mid-terms is 365.2422 รท 12 = 30.4368 days, which means 30 or 31 days. The Earth's orbit around the Sun is elliptical, and it moves faster near the perihelion (spring and autumn equinoxes). The time between two solar terms can be as long as 31.45 days. However, the average length of a synodic month in the lunar calendar is only 29.5306 days, with small months being 29 days and large months 30 days. This leads to situations where some months (usually small months) start after the previous mid-term has passed and end before the next mid-term arrives. For instance, in 2001 (Xin Si Snake Year), the Mid-Spring was on May 21 (the 29th day of the fourth lunar month). The first day of the next lunar month was on May 23, which had already passed the Mid-Spring. However, this lunar month ended on June 20, while the Summer Solstice was on June 21. Therefore, this lunar month did not have a "mid-term", and since it followed the fourth lunar month, it was called the leap April. According to this rule of intercalation, there were leap July in 2006, leap May in 2009, leap April in 2012, leap September in 2014, leap June in 2017, leap April in 2020, and leap February in 2023.
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The average interval between two mid-terms is 365.2422 รท 12 = 30.4368 days, which means 30 or 31 days. The Earth's orbit around the Sun is elliptical, and it moves faster near the perihelion (spring and autumn equinoxes). The time between two solar terms can be as long as 31.45 days. However, the average length of a synodic month in the lunar calendar is only 29.5306 days, with small months being 29 days and large months 30 days. This leads to situations where some months (usually small months) start after the previous mid-term has passed and end before the next mid-term arrives. For instance, in 2001 (Xin Si Snake Year), the Mid-Spring was on May 21 (the 29th day of the fourth lunar month). The first day of the next lunar month was on May 23, which had already passed the Mid-Spring. However, this lunar month ended on June 20, while the Summer Solstice was on June 21. Therefore, this lunar month did not have a "mid-term", and since it followed the fourth lunar month, it was called the leap April. According to this rule of intercalation, there were leap July in 2006, leap May in 2009, leap April in 2012, leap September in 2014, leap June in 2017, leap April in 2020, and leap February in 2023.
Everyone's life path is different. Click on the following excellent calculations to see how your fate is.
