Is astrolabe time calculated according to normal time or apparent solar time?

The astrolabe time is calculated by normal time, not by apparent solar time. For the determination of birth time and constellation, the local birth time, that is, normal time, is generally adopted, regardless of the apparent solar time.

For example, if you measure constellations in China, no matter which city you are in, the constellations and astrolabes you find are based on Beijing time. However, if you are in France, although you are also an Aquarius, the characteristics of Aquarius displayed on the astrolabe may be different from those measured in China, because there is a time difference between France time and Beijing time.

The above information is for reference only. If necessary, you can refer to the professional astrology website.