How long after Aharon's (Aaron's) death did Mosheh (Moses) speak the words in Deuteronomy?

Answer From The Annual Reading Schedule - Week 41 Notes For Deuteronomy: In the 40th year after the children of Yisra'el (Israel) had come out of the land of Mitsrayim (Egypt), on the 1st day of the 5th month, when Aharon (Aaron) was 123 years old, he died (Numbers 33:38-39). Mosheh (Moses) spoke in the 40th year, in the 11th month, on the 1st day of the month (Deuteronomy 1:3) – this is exactly 6 months later.