2018年IAO理论低年组第2题-火星大冲

英文题目

Great oppositions of Mars. On the morning of July 27, 2018, Mars was in a great oposition (see attached ephemeris), The great oppositons of Mars (the situations when this planet is seen most brightly in comparison with the visibility during other oppositions) are repeated every 15 or 17 years. So the previous opposition (which is ales called the "greatest", since Marswas so bright only once in many centuries) was on August 28, 2003, and the next one will occur in 2035.