The sun 's most southerly position , which is attained at the northern hemisphere 's winter solstice , is now called the Tropic of Capricorn , a term which also applies to the line on the Earth at which the sun is directly overhead at noon on that solstice .
The sun 's most southerly position is now called the Tropic of Capricorn . This term also applies to the line on earth where the sun is directly overhead at noon on that solstice .