1.   Although this is hottest time of year, the earth will reach aphelion, its farthest point from the sun, on Friday.

2.   Although this is normally the hottest time of year, the earth will reach aphelion, its farthest point from the sun, Friday.

3.   Sunday the earth reaches perihelion, its closest approach to the sun than at any time during the year.

4.   This past weekend, the earth reached perihelion, its closest approach to the sun during the year.