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Each planet has a slightly elliptical orbit and perihelion is the name given to the position in the orbit where it is closest to the Sun.

So the Earth's average distance is 149.6 million km with an eccentricity of 1/60 which means that its distance varies 2.5 million km either side of the average. At perihelion, the distance is 147.1 million km about Jan. 3rd each year.

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