Uranus entered Aries on March 11th, 8.26pm GMT, to be precise, the day of the earthquake in Japan.
I do not want to sound like a Cassandra, this is why I was vague and I am not writing much.
Anyway a date for further disruption ( war , earthquakes, major changes in energy ) is April 2nd, when both Moon and Mars will be conjuncting Uranus and squaring Pluto. Saturn opposing the Sun and Jupiter will give a lot of frustration and diplomatic work might just be ineffective. It will be hard times, the only planet which gives some positive hope is Mercury, sextile MC, letting me think something important will be understood, so as to lay the foundations for a better world in later days