Rock crawling is an extreme form of off road driving using modified vehicles to overcome obstacles. Drivers drive four-wheel-drive vehicles over very harsh terrain. Driving locations include boulders, mountain foothills, rock piles, mountain trails. Rock crawling is about slow-speed, careful and precise driving, through large gear reductions in the vehicles drive train.
SkyChart III is a planetarium and telescope control program that shows the sky from any location, past or future, on Earth or beyond.
