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Pyungchondaero-15 평촌대로 –15 Mystery Cache

Hidden : 6/10/2022
Difficulty:
3.5 out of 5
Terrain:
3.5 out of 5

Size: Size:   other (other)

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Geocache Description:


Congrats to Jiho Kim on FTF! on Aug 20, 2022

 

The cache is NOT at the above coordinates.

 

 

 

절기

절기(이십사절기, 24절기, 二十四節氣)는 한국, 중국, 일본 등 동아시아 지역에서 태양년(太陽年)을 태양의 황경(黃經)에 따라 24등분하여 계절을 자세히 나눈 것으로 절후(節候시령(時令)이라고도 한다. 

황경이란 태양이 춘분점을 기점으로 황도를 움직인 각도로, 황경이 일 때를 춘분으로 하여 표와 같이 15°간격으로 24절기를 구분한다. 절기와 절기 사이는 대략 15일 간격이며, 양력 날짜는 거의 같지만 음력으로는 조금씩 달라지므로 가끔 윤달을 넣어 계절과 맞추고 있다. 24절기는 절()과 중()으로 분류되는데, 입춘 등 홀수번째 절기는 절, 우수 등 짝수번째 절기는 중이 된다. 사계절은 입춘·입하·입추·입동 등 4(四立)의 날에서 시작된다.

태양이 황도상을 진행하는 속도는 일평균 0.9856°이며, 태양의 겉보기 지름은 약 32'이므로 하루에 지름의 두 배 가까이 움직이는 셈이 된다. 더욱이 이 속도는 일정하지 않으며, 1월 초가 가장 빠르고, 07월 초가 가장 느리며, 그 속도는 평균치에서 약 3% 정도 달라진다.[3] 속도가 일정하지 않은 이유는 케플러 법칙 때문이다.

  

Solar term 

A solar term is any of twenty-four periods in traditional Chinese lunisolar calendars that matches a particular astronomical event or signifies some natural phenomenon. The points are spaced 15° apart along the ecliptic[2] and are used by lunisolar calendars to stay synchronized with the seasons, which is crucial for agrarian societies. The solar terms are also used to calculate intercalary months;[3] which month is repeated depends on the position of the sun at the time.

According to the Book of Documents, the first determined term was Dongzhi (Winter Solstice) by Dan, the Duke of Zhou, while he was trying to locate the geological center of the Western Zhou dynasty, by measuring the length of the sun's shadow on an ancient timekeeper instrument named Tu Gui (土圭). Then four terms of seasons were set, which were soon evolved as eight terms; until 104 BC in the book Taichu Calendar, the entire twenty-four solar terms were officially included in the Chinese calendar. 

Because the Sun's speed along the ecliptic varies depending on the Earth-Sun distance, the number of days that it takes the Sun to travel between each pair of solar terms varies slightly throughout the year. Each solar term is divided into three pentads [zh] ( hòu), so there are 72 pentads in a year. Each pentad consists of five, rarely six, days, and are mostly named after phenological (biological or botanical) phenomena corresponding to the pentad.

  

캐시는 다음 좌표에 있습니다  The cache is located at the following coordiantes

N 37°2A.BCD' E 126°5E.FGH

 

A : 입춘 Spring Commences -311

B : 춘분 Spring Equinox +8

C : 입하 Summer Commences -42

D : 하지 Summer Solstice  -87

E : 입추 Autumn Commences -128

F : 추분 Autumn Equinox -180

G : 입동 Winter Commences -222

H : 동지 Winter Solstice -269

 

 


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