It's time to dig out your telescopes. Tomorrow will bring Mars much closer to Earth than usual - only 43.1 million miles. That might sound like a lot, but Mars usually sits about 140 million miles away. The planet made a similar pass in 2003, but its position on the horizon should make it more viewable this time. This will be the closest it gets before 2018. Mars will reach its nearest point at 11:25 pm US Eastern Daylight Time, and will appear as a tiny, brilliant ball unless you have binoculars or another magnification device.