March 4, 2025
6 min read
CultureAstronomyResearch
Calendar: Humanity’s Companion from Ancient Times to the Present
There are three main types of calendars in the world: solar, lunar, and lunisolar. Among them, the 365-day (Gregorian) calendar is popular due to its alignment with the tropical year. The Vietnamese calendar, a lunisolar system, is deeply tied to culture through Tet and the 12-animal zodiac cycle, with subtle differences from the Chinese calendar. This is the story of how astronomy and tradition shape our perception of time in daily life.