For blood type B, the genotype is BB or BO with A as the antigens and B as antibodies. The blood type AB has the genotype to be AB. The antigens are both A & B, and no antibodies on the blood plasma. The blood type O has the genotype to be OO. There are no antigens but has antibodies to be A or B. Rhesus factor or the 'D' antigen is also found on the surface of the red blood cell. Those with it are seen to be rhesus positive or Rh+ and those without are rhesus negative or Rh-.
Dark of the Moon. The Dark of the Moon is traditionally the last three days of the Lunar cycle, immediately preceding the New Moon, and the time when the night sky is notably absent the presence of the Moon.
According to the more recent definition, a blue moon is the second full moon in a calendar month. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month (the average span between two moons is 29.5 days).