sign of the dragon, 7-9AM, fifth sign of Chinese zodiac, shin dragon radical (no. 161)
辰 centers on the fifth sign of the Chinese zodiac, associated with the dragon, the morning hours of 7–9 AM, and the direction east-southeast. Its use as a radical extends this symbolic dragon/time concept to other characters.
辰 is an ancient pictograph originally depicting a kind of agricultural tool or a shell, later borrowed for the fifth Earthly Branch and associated with the dragon. The modern form is highly stylized, and the exact pictorial origin is uncertain.
The shape of 辰 can be imagined as a dragon's coiled body with a claw at the bottom. Think of it as the dragon sign emerging in the morning (7–9 AM).
For シン, picture a dragon's shin (the front part of the leg) gleaming in the early morning light: shin -> シン, and the dragon sign 辰 is associated with that time.
the Dragon (fifth sign of the Chinese zodiac)
southeast
Boshin War (Japanese civil war between Imperial and shogunate forces; 1868-1869)
North-Star
Fire Dragon (53rd term of the sexagenary cycle, e.g. 1916, 1976, 2036)
lucky day; auspicious occasion
lucky day; auspicious occasion; happy day
auspicious date
Water Dragon (29th term of the sexagenary cycle, e.g. 1952, 2012, 2072)
Japanese invasions of Korea (1592-1598); Imjin war
Metal Dragon (17th term of the sexagenary cycle, e.g. 1940, 2000, 2060)
Earth Dragon (5th term of the sexagenary cycle, e.g. 1928, 1988, 2048)
the Sun, the Moon and the stars; the heavenly bodies
celestial bodies; stars
time; hour
timepiece; clock
Wood Dragon (41st term of the sexagenary cycle, e.g. 1964, 2024, 2084)
birthday
hour of the Dragon (around 8am, 7-9am, or 8-10am)
year of the Dragon