In recent years the concept of a constellation (formation flying) has become popular because of its potential to achieve coordinated action for remote sensing missions and mission capabilities in the long term. A constellation is a group of similar satellites synchronized to orbit the Earth optimally. Some of the advantages of the nano-satellites constellations comparing to the big satellites are: their performance, flexibility and ability to perform coordinated and distributed measurements. In spite of that, placing a satellite in orbit improperly designed can greatly reduce the effectiveness of this satellite in the accomplishment of its objectives. In addition, the inability to maintain the satellite on its orbit can cause disastrous effects on his mission. Considering all these aspects, the designs of the orbit and the orbit maintenance have a significant impact on the success of the satellite constellation's mission.