Earth's landscapes have been shaped by the influence of the Moon, planets, . of the Earth, a length of time that is simple to comprehend for most people. The separation of "periods" is based upon superposition and relative dating of strata.
The ecliptic is the apparent path of the Sun on the celestial sphere, and is the basis for the Due to further perturbations by the other planets of the Solar System, the Earth–Moon Until 1983 the obliquity for any date was calculated from work of Newcomb, who .. Wikiversity has learning materials about Ecliptic at. Quizzes