The calculation engine behind Saju (사주). Convert dates in both directions, read the Stems and Branches for any hour, and see exactly when each solar term begins — computed from real astronomy, not lookup tables.

Input calendar

Solar (양력) Lunar (음력)

Date

Lunar date · 음력

Leap month (윤달)

Time

Optional. Only the hour pillar depends on it.

Place Seoul (서울) (126.98°E) Busan (부산) (129.08°E) Daegu (대구) (128.60°E) Incheon (인천) (126.71°E) Gwangju (광주) (126.85°E) Daejeon (대전) (127.38°E) Ulsan (울산) (129.31°E) Sejong (세종) (127.29°E) Suwon (수원) (127.03°E) Changwon (창원) (128.68°E) Jeonju (전주) (127.15°E) Cheongju (청주) (127.49°E) Chuncheon (춘천) (127.73°E) Gangneung (강릉) (128.88°E) Andong (안동) (128.73°E) Gyeongju (경주) (129.22°E) Mokpo (목포) (126.39°E) Yeosu (여수) (127.66°E) Jeju (제주) (126.53°E) Ulleungdo (울릉도) (130.91°E) Pyongyang (평양) (125.76°E) Kaesong (개성) (126.56°E) Hamhung (함흥) (127.54°E) Tokyo (139.69°E) Osaka (135.50°E) Beijing (116.41°E) Shanghai (121.47°E) Yanji (연변) (129.51°E) Hong Kong (114.17°E) Taipei (121.57°E) Singapore (103.82°E) Jakarta (106.85°E) Bangkok (100.50°E) Hanoi (105.83°E) Manila (120.98°E) Sydney (151.21°E) Los Angeles (-118.24°E) New York (-74.01°E) Toronto (-79.38°E) London (-0.13°E) Paris (2.35°E) Frankfurt (8.68°E) Moscow (37.62°E) Dubai (55.27°E)

Sets the longitude for true solar time, and the historical time zone.

Advanced settings

Time standard Standard clock time Mean solar time (longitude only) True solar time (진태양시)

자시 school 조자시/야자시 (day changes at midnight) 정자시 (day changes at 23:00)

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