We observed Earth Hour on Saturday March 31st, 2012 from 20:00-21:00.
Whups! The real Earth hour was from 20:30 to 21:30. Oh well.. we shut down everything we could, went out before 20:00 and came back in around 21:15.
This image is of the Kingston skydome (light pollution) around mid-earth-hour.. 21:00 or so. We took pictures before during and after. Again this year, there was no noticeable effect on the light pollution dome of Kingston.
20120331-25-pleiades-venus-jupiter-15sec