There’s apparently a second layer to astrology that goes beyond newspaper horoscopes. According to my coworker, what time of day you were born adds a tint of good or bad fortune. For runners at the DCXC Invitational, what time of day they started their race made all the difference.  
That’s because cloud cover alternated from race to race, providing much-needed relief from heat that reached the upper 80s throughout the afternoon, while also surprising some runners when they got on the starting line, thinking the hot part of the day was behind them. Those varying conditions just hammered home that the races, divided among graduating class, existed separately of each other. The format also gives runners a chance to race against their peers only, offering each class a chance in the spotlight. That did some favors for the seniors, whose races had the most comfortable temperatures irrespective of cloud cover.