Trailing Planets . ... Of course these planets, Mercury , Venus , Mars , Jupiter , and Saturn all still dazzle in western skies near sunset, but sky gazers who want to see Mercury should look soon. Mercury starts the evening closest to the horizon - visible here above the wide bright trail left by Venus - and in the coming days Mercury will be the first to leave the evening sky entirely as it moves closer to the setting Sun. ... NASA Web Site Statements, Warnings, and Disclaimers . ...