Are the 24 solar terms in ancient times called lunar calendar? What are they called?

Twenty-four solar terms are not called lunar calendar.

Twenty-four solar terms are formulated according to the position change of the sun on the ecliptic (that is, the orbit of the earth around the sun). The lunar calendar in astronomy mainly refers to the calendar arranged according to the moon phase cycle.

The traditional summer calendar in East Asia (lunar calendar) is a kind of "combined calendar of yin and yang", which is formulated according to the operation of the day and the month respectively: the part of the month is determined based on the new moon, and the year of the year is determined based on the tropical year (solar year). Each tropical year of the solar calendar is about 365.2422 days, and the 24 solar terms are divided accordingly.

A calendar with twelve calendar months in a year. In the process of calendar development and evolution, the emergence of 24 solar terms was used to scientifically guide agricultural production, and the lunar calendar (Han calendar) was formed. Although the lunar calendar and lunar calendar are commonly known as lunar calendar, ancient calendar, Han calendar, summer calendar and old calendar, there are differences between lunar calendar and lunar calendar (Han calendar). The traditional summer calendar (Han calendar) is actually a kind of yin-yang calendar. On the contrary, the Islamic calendar is a pure lunar calendar.