Personal Solstice

The dictionary defines Solstice as the time when the sun reaches its highest or lowest point at noon, resulting in the shortest and longest days of the year. It seems to me that each life could have at least two personal solstices; that is, at least twice in a lifetime we could experience a highest and a lowest point. Perhaps this occurs more often? High points and low points could happen daily, weekly, monthly, and yearly? There are so many ways to consider whether an event marks a high point or a low one ... or somewhere in between the extremes of high and low. Life sometimes resembles the path of a roller coaster. I don't have to mark the high and low points to enjoy the ride.