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.
A market-on-close order (MOC) is a non-limit market order that is executed as close to the end of the market day as possible. All MOC orders must be submitted by 3:45 p.m. ET on the NYSE and by 3:50 p.m. ET on the Nasdaq, as both of them close at 4 p.m. and neither exchange allows for the modification or cancellation of MOC orders after those times.