Chinese Calendar (农历): The Chinese Calendar, also known as the lunar calendar, is based on the cycles of the moon, and it has been used for thousands of years in Chinese culture. Unlike the Gregorian calendar, which is solar-based, the Chinese calendar incorporates both lunar and solar elements. It divides the year into 12 months, each corresponding to a lunar cycle, and it also accounts for the leap months to ensure the calendar stays aligned with the solar year. The Chinese calendar is traditionally used for determining auspicious dates for important events like weddings, festivals, and even conception, including the prediction of a baby's gender.

Historical Use of the Chinese Calendar: The Chinese calendar has a long history of guiding important life events. It was historically used to choose favorable times for various activities, including weddings, births, and even conception. This belief in choosing an auspicious time for conception extends to the use of the Chinese Gender Chart, which, based on the mother's lunar age and the month of conception, was believed to determine whether the baby would be a boy or a girl.