Although the Moon is Earth's only natural satellite, there are a number of near-Earth objects (NEOs) with orbits that are in resonance with Earth. These have been called, inaccurately but provocatively, second, third or other moons of Earth. NEOs include quasi-satellites that orbit the Sun in resonance with Earth, which appear to orbit a point other than Earth itself, such as the orbital path of the NEO asteroid 3753 Cruithne.
Definition of CONVERGENCE. 1. : the act of converging and especially moving toward union or uniformity; especially: coordinated movement of the two eyes so that the image of a single point is formed on corresponding retinal areas.
confluence (plural confluences) 1  The place where two rivers, streams, or other continuously flowing bodies of water meet and become one, especially where a tributary joins a river. 2  The act of combining which occurs at the place where rivers and the lake meet. 3  A convergence or combination of forces, people, or things. The confluence of our skills resulted in a successful home renovation project. (biology) The proportion of cells, in a culture medium, that adhere to each other.