World's largest hot desert. Located in north Africa and covers over 3,500,000 square miles (9,000,000 sq km) or roughly 10% of the continent. Mean temperature over 30 degrees C. Variations may also be huge, from over 50 degrees C during the day, to temperatures below 0 at night in summer.
Fall begins (Northern H.) History. Fall begins in the Northern Hemisphere when the Sun is perpendicular to the equator. This day has equal hours of day and night. The first day of Fall is also called the Autumnal Equinox. In many areas it coincides with harvests. The first day of Fall happens between each year between September 22 and 24.
confidence votes 225 astronomical in the northern hemisphere of earth fall begins on the autumnal equinox 22 23 september in persian calender it will begin at the first day of mehr and ends on the winter solstice 21 22 decemberonfidence votes 225 astronomical in the northern hemisphere of earth fall begins on the autumnal equinox 22 23 september in persian calender it will begin at the first day of mehr and ends on the winter solstice 21 22 december