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.
10 Common Symptoms of Adult Autism. Diagnosing autism in adults can prove challenging, however, there are common symptoms of autism that can be recognized in adults. Here are 10 of them to watch out for. Keep in mind that if you only have one or two of these symptoms, it does not necessarily mean that you suffer from autism. Look for several of these symptoms as a cause for concern.