Orbit Descending Node

"The point in a satellite's orbit at which it crosses the equatorial plane from north to south." (National Aeronautics and Space Administration, 2014)

Sources

"Descending Node". NASA Glenn Research Center, National Aeronautics and Space Administration. Last modified June 12, 2014.
https://www.grc.nasa.gov/www/k-12/TRC/laefs/laefs_d.html#descending_node.
Accessed February 20, 2019.