NOTE: the webcast for the 100 Hours of Astronomy Awards Ceremony will not be broadcast on Ustream. There is a link on the 100 Hours website to the webcast: http://www.100hoursofastronomy.org. The webcast can also be downloaded later from this site. The 100 Hours of Astronomy Awards Ceremony is being held live on Tuesday, Aug 11, at 16:00 local time (19:00 GMT/UTC) in Rio de Janeiro, as part of the International Astronomical Union General Assembly. The webcast will be delayed two hours, and will happen at 18:00 local time (21:00 GMT/UTC). The ceremony will be hosted by 100 Hours of Astronomy Co-Chair Mike Simmons and will include eight award presentation videos by 100HA Task Group members from around the world. Acceptance videos from the award winners, representing countries around the globe, will also be shown.