'Blue moon' appears for a second time in 2018

The blue moon rises above the World Heritage site Table Mountain National Park in Cape Town, South Africa, on Saturday, March 31, 2018.A 'blue moon' appeared for the second time this year on Saturday, March 31, 2018. A blue moon is means a second full moon within one a calendar month, which is quite rare. The next blue moon is due in October 2020. [Photo: IC]