Xp: min distance from sun (Perihelion)
Xa: max distance from sun (Aphelion)
a: Semi-major axis =150 million km
Xp = a(1-e) = 150,000,000(1-.0167)~147.5 Million Km
Xa = a(1+e) = 150,000,000(1+.0167)~152.5 Million Km
Since e~0, it's nearly a circular orbit.
Fun Fact: Winter in the Northern Hemisphere occurs at Perihelion (Closest to sun)
This is because distance is not as important as Solar Constant (Earth axis tilt)