Day of Morning- Tenth of Tevet

Tenth of Tevet (Hebrew: עשרה בטבת, Asarah BeTevet), the tenth day of the Hebrew month of Tevet, is a minor fast day in Judaism. It is a "low fast" observed from sunrise to sunset. Historically, the fast commemorates the siege of Jerusalem by Nebuchadnezzar II of Babylonia—an event that began on that date and ultimately culminated in the destruction of Solomon's Temple (the First Temple) and the conquest of the Kingdom of Judah.
Taken from Wikipidia.