Primary market prices are often set beforehand, while prices in the secondary market are determined by the basic forces of supply and demand. If the majority of investors believe a stock will increase in value and rush to buy it, the stock's price will typically rise.
The next good solar eclipse visible from Pennsylvania will be on 21st August 2017 when a large partial eclipse occurs (80% of the Sun's diameter obscured at maximum). This eclipse will be seen as total along a line from Oregon to South Carolina.
The last total solar eclipse visible from the continental United States was in 1979, and it was only over a corner of the Pacific Northwest. Something like this summerâs event, where so many people on land can see a total solar eclipse, is exceptionally rare â although the United States actually will experience another one, crossing an opposite diagonal swath of the country, in 2024.