Mercury's location in your birth chart influences all of this! Mercury never travels more than 28 degrees from the Sun, so many people will have Mercury in the same zodiac sign as their Sun.
From Monday to Friday, the stock market remains open from 9:30 am to 4:00 pm, EST. PST time is 6:30 am to 1:00 pm.
Except those regions that use PST all year long, PST starts at 2 AM on the first Sunday of November each year, turn the clock 1 hour back to 1 AM at that time, and PST ends at 2 AM on the second Sunday in March each year, turn the clock 1 hour forward to 3 AM at that time.