Summer Solstice... occurs at the epoch of the summer season (when the tilt of the Earth's axis is pointed toward the Sun).
(Summer Solstice; occurs; T:at the epoch of the summer season) (the tilt of the Earth's axis; is pointed; toward the Sun)
Summer Solstice the tilt of the Earth's axis
occurs is pointed
T:at the epoch of the summer season
toward the Sun