Do the solar terms on the calendar refer to Beijing time or Greenway time?

I think your question should be whether the solar terms on the calendar are solar or lunar. We China people's solar terms and time must be calculated according to Beijing time.

As for whether the 24 solar terms in China are based on the Gregorian calendar or the lunar calendar, in fact, all the 24 solar terms are based on the lunar calendar. Perhaps some people don't understand why some solar terms, such as the vernal equinox, Qingming, summer solstice, autumn equinox and winter solstice, are determined according to the Gregorian calendar. That's because the lunar calendar itself is a calendar that combines the yin and yang calendars. The average calendar month is based on the moon's profit and loss period. Setting leap months makes the average calendar year a tropical year. Then, 24 solar terms are established to reflect the seasonal changes. Twenty-four solar terms originated in the Yellow River basin and were formulated according to the movement cycle of the earth around the sun. They are a kind of solar calendar, which is also followed by many basic agriculture. It can be said that our current lunar calendar is a combination of yin and yang calendars.

The "lunar calendar" mentioned in daily life is actually an informal name of the lunar calendar.