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.
Since lunar eclipses are caused by the Moon passing through the Earth's shadow and since there are 2 parts of a shadow, there are 3 types of lunar eclipses: A penumbral eclipse occurs when the Moon passes through the penumbral part of Earth's shadow.