MIKE MOSS SAYS:     Barbara,    At 7:00 pm EDT on 10 Aug in Cary, the sun should be 13 degrees above the horizon at an azimuth of 280 degrees (i.e. 10 degrees north of due west) and it will set about 8:11 pm. Typically, prime sunburn time during the summer is considered to be the hours between about 10 am and 4 pm or so, and by the time the sun is down to a 13 degree elevation, its rays will be much less intense. However, for someone who is especially sensitive or especially prone to burning, it probably wouldn't hurt to have on some mid-level SPF sunscreen, just to be sure, especially if you're planning to head out well before the show starts.