The April Full Moon will be occuring on Tuesday, 15 April 2014 (at 5:13 pm CST) and fall in the sign of Libra, the Scales, as well as it being a total lunar eclipse (however as the moon will be below the horizon in Adelaide some of the time, the first part of the eclipse will not be visible). A lunar eclipse occurs when the sun, earth and moon line up so the earth's shadow falls on the moon, darkening it.
According to USA Today, the April eclipse "marks the start of a lunar tetrad. That event occurs when there are four successive total lunar eclipses, with no partial lunar eclipses in between, each of which is separated from the other by six full moons." The other three eclipses of this lunar tetrad are on 8 October this year and then 8 April and 28 September in 2015.