It consists of a papule from which the contents are not easily expressed. When inflamed these lesions form pustules and nodules. The open form of comedo, called a blackhead, is rarely inflamed. It has a dilated opening from which the oily debris is easily expressed.
The Tropic of Capricorn is the circle marking the latitude 23.5 degrees south where the sun is directly overhead at noon on December 21, the beginning of winter in the northern hemisphere.
The reason for the location of the Tropic of Cancer and the Tropic of Capricorn at 23.5Â° north and south respectively is due to the axial tilt of the Earth. The Earth is titled 23.5 degrees from the plane of the Earth's revolution around the sun each year.The area bounded by the Tropic of Cancer on the north and Tropic of Capricorn on the south is known as the tropics.. This area does not experience seasons because the sun is always high in the sky.he Earth is titled 23.5 degrees from the plane of the Earth's revolution around the sun each year. The area bounded by the Tropic of Cancer on the north and Tropic of Capricorn on the south is known as the tropics.. This area does not experience seasons because the sun is always high in the sky.