Twilight planets Mercury aligns with Mars and Neptune. Speedy Mercury makes a brief appearance in the bright twilight evening skies this month. Mercury will be very low (6 degrees) in the west-southwest sky tonight about 20 minutes after sunset. If the horizon is clear, Mercury will appear as a modest star just above the trees. Binoculars may help you spot Mercury and then Mars about 4 degrees above Mercury. If the air is steady, telescope observers may spot faint Neptune just a moon-width up from Mars. Each night, Mercury will climb a bit as Mars holds steady and Neptune sinks …