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The Northern Hemisphere is tilted closest to the sun during its summer solstice, when the southern hemisphere is pointed away during the winter solstice.
Assuming the observer is in the North, then the southern hemisphere would be tilted towards the sun during the Winter Solstice in December. However, for observers in the Southern Hemisphere, the Winter Solstice would occur in June, and the northern hemisphere would be tilted towards the sun.
During the winter solstice, the northern hemisphere of the Earth is tilted away from the sun; during the summer solstice, the northern hemisphere of the Earth is tilted towards the sun.
In the northern hemisphere's summer solstice, around the 21st of June, the northern hemisphere is tilted towards the sun. In the southern hemisphere's summer solstice, around the 21st of December, the southern hemisphere is tilted towards the sun.
That's the time of the June solstice, which is the summer solstice in the northern hemisphere and the winter solstice in the southern hemisphere.
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For the northern hemisphere: During the summer solstice, the Sun is as far north as she can get. During the winter solstice, the Sun is as far south as she can get. For the souther hemisphere it is the other way round.
The length of the day varies between the Northern and Southern Hemispheres due to the tilt of the Earth's axis. During the winter solstice, the Northern Hemisphere experiences shorter days while the Southern Hemisphere has longer days. The reverse is true during the summer solstice.
The sun's rays strike the earth at 90 degrees (verticle) at their northernmost position during the summer solstice for northern hemisphere and at their southernmost position during the summer solstice for the southern hemisphere. These positions are known as the Tropic of Cancer in the northern hemisphere and the Tropic of Capricorn in the Southern Hemisphere.
The sun reaches in Northernmost apparent position.
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About 23.5 degrees