how far to mars at its closest
In 2016, Mars will appear brightest from May 18-June 3. Its closest approach to Earth is May 30. That is the point in Mars' orbit when it comes closest to Earth. Mars will be at a distance of 46.8 million miles (75.3 million kilometers). Mars reaches its highest point around midnight -- about 35 degrees above the southern horizon, or one third of the distance between the horizon and overhead.