The Economist provides a concise explanation as to why tomorrow, Quds Day, is shaping up to be such an important day:
A first test looms on September 18th, which the Islamic Republic has long celebrated as Jerusalem Day, an occasion intended to show Muslim solidarity with the Palestinians. Opposition leaders have already appropriated such Islamic symbols as the colour green and the cry of “Allahu Akbar!” Now they have called for a huge turnout on Jerusalem Day, vowing to attend the event themselves. Rather than small pro-government crowds chanting “Death to Israel!”, this year’s protest may look more like the vast shows of people-power sparked by June’s election result, with the anger directed at Iran’s own rulers rather than distant Zionist oppressors.
It's past two in the morning in Tehran, and the night's silence is the calm before the storm.
