The upper panel shows that on the winter solstice (which occurs around December 21), the northern half of the Earth is tilted away from the Sun.
(the winter solstice; occurs; T:around December 21) (The upper panel; shows; that on the winter solstice (which occurs around December 21), the northern half of the Earth is tilted away from the Sun) Context(The upper panel shows,List([0, 21))):(the northern half of the Earth; is tilted; away from the Sun; T:on the winter solstice)
The upper panel shows,List([0, 21))
the winter solstice The upper panel the northern half of the Earth
occurs shows is tilted
T:around December 21
that on the winter solstice (which occurs around December 21), the northern half of the Earth is tilted away from the Sun
away from the Sun T:on the winter solstice