Lunar Calendar Converter

The solar calendar (Gregorian) is based on Earth's orbit around the Sun (~365.25 days), while the lunar calendar is based on the phases of the Moon (~29.53 days per month). A lunar year is about 354 days, shorter than a solar year, so a leap month is added roughly every 2–3 years to keep the calendars aligned with the seasons.

A leap month is an extra month inserted into the lunar calendar to compensate for the difference from the solar year. It occurs approximately every 2–3 years, with 7 leap months in every 19-year cycle. In Korean tradition, the leap month is associated with customs around ancestral rites and moving.

Ganzhi combines 10 Heavenly Stems (甲乙丙丁戊己庚辛壬癸) with 12 Earthly Branches (子丑寅卯辰巳午未申酉戌亥). Their least common multiple is 60, creating the 60-year cycle. 1984 was a 甲子 (Jiǎzǐ) year, and 2044 will be the next.

Yes. Since the lunar calendar follows Moon cycles, the same lunar date corresponds to a different solar date each year — typically shifting by 1 to 2 weeks relative to the previous year.

Solar terms are based on the solar calendar. The 24 solar terms follow the Sun's position on the ecliptic, so they fall on nearly the same solar dates every year (within 1–2 days). For example, Start of Spring (입춘) falls around February 4, and Winter Solstice (동지) around December 22.