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.
This eclipse will be completely visible over Africa and central Asia, visible whilst rising over South America, western Africa and Europe, and whilst setting over eastern Asia. In western Asia, Australia and the Philippines, the lunar eclipse will be visible just before sunrise. The North Americans will miss out.