Around 2 minutes and 30 seconds of darkness around 1:15pm on Monday, Aug. 21, 2017, will present Missouri businesses and tourism with perhaps its biggest international travel marketing opportunity ever, especially to visitors from Asia, Europe and the northeast United States. The occasion is a total eclipse of the sun, the first in 99 years to cross America's heartland. Total solar eclipses routinely draw big crowds of viewers wherever they occur on the globe. The late August event is prime summer vacation season and the eclipse could be the clincher for attracting visitors from European and Pacific-rim countries to spend vacations in Missouri.