星座
xīng zuò · HSK 7
astrological sign
⭐♈ 星座 = 星 star + 座 seat: the seats where stars sit = constellation / zodiac sign
星 means star and 座 means seat or place. A constellation is a fixed arrangement of stars, like assigned seats in the sky. The same word covers astrological signs (Leo, Aries) since each is a star-grouping.
座 — 广 (shelter) + 坐 (to sit)
Originally written as 坐, meaning 'to sit' (two people 人人 sitting on the ground 土). The shelter radical 广 was added to specify the place where one sits — a seat, throne, or platform. 坐 remained the verb 'to sit,' while 座 became the noun 'seat.'