Perigee
= Perigee
{title2=$r_{\mathrm P}=a(1-e)$}
The <periapsis> of an Earth-centred <orbit>. For an <elliptic orbit> its distance from the Earth's centre is $a(1-e)$. Both this distance and the <apogee> distance are measured from the force centre, rather than as heights above Earth's surface.