These four events repeat every 'tropical' year (365 days, 5 hours, 49 minutes), so they become later by about six hours, or (if there has been an intervening leap day) earlier by about 18 hours, from one year to the next.
The three distinctive signs and symptoms of autism include problems with verbal and nonverbal communication, difficulties with social interaction, and repetitive behaviors or narrow, obsessive interests. There are three distinctive symptoms of autism.
autism is characterized by a person having deficits in 3 core areas: social skills, speech, and behaviors. what symptoms are shown by each person are as different as people are themselves. you would be hard put to find 2 people who display the exact same characteristics. some of them in the social category are: