What is the meaning of 辰?

the Dragon, the fifth of the twelve Earthly Branches

by extension from the zodiac:

1. the name of the year or day corresponding to the fifth in a cycle of twelve
2. roughly east-southeast, specifically 30° south of due east (i.e. a bearing of 120°)
3. the hour of the dragon, specifically 7:00 AM to 9:00 AM; sometimes treated as 8:00 AM to 10:00 AM instead
4. alternate name for 三月 (sangatsu, “the month of March”)

the name of the year or day corresponding to the fifth in a cycle of twelve

roughly east-southeast, specifically 30° south of due east (i.e. a bearing of 120°)

the hour of the dragon, specifically 7:00 AM to 9:00 AM; sometimes treated as 8:00 AM to 10:00 AM instead

alternate name for 三月 (sangatsu, “the month of March”)

the Dragon, the fifth of the twelve Earthly Branches

chữ Hán form of Thìn (“fifth of the twelve earthly branches”)

chữ Nôm form of thì, thời (“time; period”)

chữ Nôm form of thì, thời (“topic marker”)

Source: wiktionary.org