Earth at perihelion
Publiée le 2007-12-04
aphelion). The Earth is going to pass a its perihelion on January 2nd, 2008 at 23h 51min UTC. The distance Earth-sun will be then of 0.98328 AU ( astronomical
units) that is 147 096 593km. This minimum value is not the same from one year to the next because the orbit of the Earth is not a perfect ellipse but an ellipse perturbed by the gravitational effects. We shall notice that the
distance Earth-sun has not enough effect on the phenomenon of the seasons which is
essentially due to the slope of the Earth rotation axis on its orbit.
The orbit of the barycenter Earth-Moon around the Sun is in first estimate an ellipse.
The distance Earth-sun is not thus constant and present a minimum (the perihelion)
and a maximum (the |