Why it matters:
The Iranian nation toppled the US-backed Pahlavi regime 46 years ago, on February 11, 1979, ending 2,500 years of monarchic rule in the country.
The big picture:
The annual nationwide celebration will start all over Iran on Feb.1, symbolically marking the date of the homecoming of the late founder of the Islamic Republic, Imam Khomeini. The Imam arrived back home from exile at 9:27 a.m. local time on February 1, 1979.
Go deeper:
Here we look at the Islamic Revolution of Iran's achievements after 46 years.
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