This is the ninth month of the Hebrew calendar. The twentieth day is near the middle of December on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-ordinal]])
The abstract noun "treason" can be translated as a verb. AT: "helped the enemies of your people" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
# so as to increase Israel's guilt
"and now God considers us guilty of worse sin than before"