Earth: Day Zero • Paper 069 of 512

Earth–Moon Distance Relationships

The present Earth–Moon distance represents one of the most fundamental observations within the Earth–Moon system.

Any reconstruction extending to Earth's earliest history must remain compatible with the existence of a stable satellite at substantial orbital separation.

Observable Constraint

The modern Earth–Moon separation is measurable and independent of any specific formation model.

As such, it provides an important boundary condition for evaluating candidate reconstructions.

Historical Evolution

The Earth–Moon system has evolved through time.

Consequently, present-day orbital distance must be interpreted within the context of long-duration orbital evolution rather than as a static property.

Framework Relevance

The Earth: Day Zero framework evaluates whether candidate reconstructions remain compatible with the existence and evolution of the Earth–Moon separation.