In the summer, the Northern Hemisphere is slanted toward the sun, making the days longer and warmer than in winter.The first day of summer,June 21,is called summer solstice and is also the longest day of the year. However, June 21 marks the beginning of winter in the Southern Hemisphere,when that hemisphere is tilted away from the sun.It can be inferred from the passage that,in the Southern Hemisphere,June 21 is the