He was at the meridian of his power then.那时他获得了最高权力。The prime meridian of longitude is in Greenwich, London.本初子午线位于伦敦南部的格林尼治。Every place on the same meridian has the same longitude.同一经线上的地方其经度相同。The meridian is an imaginary line drawn from pole to pole.子午线是从极点到极点的一条假想线。