The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice.
(the Earth's North Pole; is tilted; closest to the sun; T:The day) (The day that the Earth's North Pole is tilted closest to the sun; is called; the summer solstice)
the Earth's North Pole The day that the Earth's North Pole is tilted closest to the sun
is tilted is called
closest to the sun T:The day
the summer solstice