- Mesarthim (stars.astro.illinois.edu)
MESARTHIM (Gamma Arietis). Shining third among the stars of the flat triangle that make the classical figure of Aries, the Ram (for that reason gaining the Gamma designation), Mesarthim actually takes fourth place in the constellation after non-named 41 Arietis, which glows softly off to the northeast.
- Drainage basin (Wikipedia)
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern.