Question

Definition of perihelion, orbit and civilization

Answer 1

Perihelion : the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

"today Mercury is at perihelion"

Orbit : the regular repeated elleptical course of a celestial object is called orbit.

Civilization : the state of human development and organisation which is considered most advance.

Answer 2

Perhelion - of any orbit of celestial body about the sun is the point where the body comes closest to the sun.

orbit - is a gravitationaly curved trajectory of an object as trajectory of a planet around a star or natural satellite

civilization - is any complex society characterized by urban development, social stratification imposed by a cultural elite, symbolic systems of communication etc.