Simplify the following text for a Grade 11 native English-speaking person.
Original: The Tropic of Capricorn is so named because about 2,000 years ago the sun was entering the constellation Capricornus ( capricorn is Latin for goat horn ) at the December solstice .
Simplified: The Tropic of Capricorn is named because about 2000 years ago the sun was entering the constellation Capricornus on the December solstice .