Codon Codon is a combination of three successive nucleotides in a DNA or RNA strand. All the nucleic acids, DNA and RNA, have nucleotides sequenced as a set of codons. Each nucleotide consists of a nitrogenous base, one of A, C, T/U, or G.
Phases of the moon are simply how much sun is hitting the surface of the moon, with the moon being between the earth and the sun. Lunar eclipses occur when a conjunction between the earth and the sun... with the earth casting a shadow on the full moon.
A lunar eclipse occurs when the Earth is between the full moon and the sun. The Earth's shadow covers the moon, which often has a red color, hence the blood moon nickname. Although it's completely in the shadow of Earth, a bit of reddish sunlight still reaches the moon.