The green color of the dome comes from its copper plating.
The roof and dome are supported by 24 pillars.
The 24 pillars represent 24 different meteorological events on the Asian lunisolar calendar, which was used in Korea until 1895.
Ipchoon (Start of spring - February 4)
Woo-sue (Rain/More rain than snow - February 19)
Gyeongchip (When insects emerge from hibernation - March 6)
Chunbun (The spring/vernal equinox - March 21)
Jeongmyung (clear and bright/Time to tend to graves - April 5)
Gok-woo (Grain rain/Rain to help grain grow - April 20)
Ipha (Start of summer - May 6)
Soman (Grains are plump - May 21)
Mang-jong (Barley harvesting season - June 6)
Haji (The summer solstice - June 21)
Soseo (Minor heat - July 7)
Daeseo (Midsummer/Major heat - July 23)
Ipchu (The start of autumn - August 8)
Cheoseo (Limit of heat - August 23)
Baekro (White dew falls - September 8)
Chubun (The autumnal equinox - September 23)
Hanro (Cold dew - October 8)
Sang-gang (Frost appears - October 23)
Ipdong (The start of winter - November 7)
Soseol (Minor snow - November 22)
Daeseol (Heavy snow - December 7)
Dongji (The winter solstice - December 22)
Sohan (Mild cold - January 6)
Daehan (Midwinter - January 20)
Each pillar has eight sides.
There are eight pillars on each of the southeast and northwest faces of the building.
There are six pillars on each of the northeast and southwest faces of the building.
