In 1981, the first scientific observation of coral spawning took place. Coral spawning can be thought of as a coral orgy or sex on the Great Barrier Reef, with the process beginning six months prior when eggs and sperm begin to form in the coral. Certain factors must be present for the coral spawning to take place, such as water temperatures being 27 degrees Celsius and a full moon (the spawning with occur from the 2nd to 6th night following).
If you want to see coral spawning for yourself first-hand, visit Queensland, Australia, from November 15-17th, 2011 and signup for a night dive. While the dates are not 100% guaranteed, it is predicted that this is when the coral spawning will occur this year. Want to check it out from the comfort of your computer chair? Watch this video: