spaceplace.nasa.gov

X0mN6 TIL that Earth is closer to the Sun during (northern) WINTER, not summer. The seasons are caused by Earth's tilted axis, not the distance from sun.
VBpjk TIL that Planets don't orbit exactly the sun's center — they orbit a common center of mass in between their and the sun's center called the barycenter. The barycenter of Jupiter and sun actually just outside the sun's surface!
J1d9j TIL that on Jupiter's moon Io, tidal effects from Jupiter cause the ground itself to move up and down by 300 feet. Typical tidal range on earth is 3 feet in the open ocean.