There will be two moons in the sky on 27 August* *27th Aug the Whole World is waiting for...* Planet Mars will be the brightest in the night sky starting August. It will look as large as the full moon to the naked eye. This will culminate on Aug. 27 when Mars comes within 34.65M miles of earth. Be sure to watch the sky on Aug. 27 12:30 am. It will look like the earth has 2 moons. The next time Mars may come this close is in 2287. NO ONE ALIVE TODAY will ever see it again.