A lunar eclipse - often known as a 'blood moon' - occurs when the moon moves directly into the shadow of the Earth cast by the sun.
As the light bounces off the moon and is refracted through the Earth’s atmosphere, it is given a reddish-tint, in a similar manner to sunsets and sunrises.
Today’s eclipse is due to begin in the Cook Islands when the moon rises at 5:37pm.
The full eclipse will kick off at 9.06pm and last for 78 minutes; for the best effect, viewers should be looking into the night sky at 9:46pm.
A lunar eclipse occurs three times a year maximum, but not all of those are total eclipses.
Arona Ngari, Director of the Cook Islands Met Service, is predicting good conditions for moon-watching tonight.
“I reckon we should be in for a cracker with this blood moon.”