noun
auspicious day; lucky day; happy occasion
A somewhat formal or literary term for a day considered fortunate or suitable for celebrations. Often used in greetings or well-wishes for special events.
本日は佳辰、おめでとうございます。
Congratulations on this auspicious day.
結婚式の佳辰を迎え、心よりお祝い申し上げます。
On this happy occasion of your wedding, I offer my heartfelt congratulations.
The word is composed of 佳 (good, beautiful) or 嘉 (auspicious) and 辰 (day, time). The exact historical derivation is uncertain, but it has been used in classical and formal Japanese to denote a fortunate day.