A space system comprising: - two main satellites (4, 5) each describing a distinct elliptical orbit (6, 7) around the Earth and at least one earth station configured to exchange data with at least one of said main satellites (4, 5), each of the two orbits verifying the following characteristics: - the inclination of the plane of the orbit in relation to the equatorial plane lies between 55° and 65°; - the eccentricity of the orbit lies between 0.2 and 0.3; - the major half-axis of the orbit is set so as to obtain a geosynchronous orbit; and - the two main satellites having a right ascension difference of the ascending node of 180° and with a true anomaly difference of 180°; - the system being characterized in that the two orbits verify the following characteristics: - the argument of the perigee lies between 240° and 265° or between 275° and 300° for the coverage of a zone of latitude above at least 55° combined with an additional zone of latitudes below at most 55° and of longitudes lying within an interval of values having a length below a first threshold; or lies between 60° and 85° or between 95° and 120° for the coverage of a zone of latitude below at most -55° combined with an additional zone of latitudes above at least -55° and of longitudes lying within an interval of values having a length below a second threshold; and - the longitude of the ascending node is defined as a function of the additional zone, such that it lies within an interval of values centred on the average longitude of the additional zone and having a length less than 80°. - two main satellites (4, 5) each describing a distinct elliptical orbit (6, 7) around the Earth and at least one earth station configured to exchange data with at least one of said main satellites (4, 5), each of the two orbits verifying the following characteristics: - the inclination of the plane of the orbit in relation to the equatorial plane lies between 55° and 65°; - the eccentricity of the orbit lies between 0.2 and 0.3; - the major half-axis of the orbit is set so as to obtain a geosynchronous orbit; and - the two main satellites having a right ascension difference of the ascending node of 180° and with a true anomaly difference of 180°; - the system being characterized in that the two orbits verify the following characteristics: - the argument of the perigee lies between 240° and 265° or between 275° and 300° for the coverage of a zone of latitude above at least 55° combined with an additional zone of latitudes below at most 55° and of longitudes lying within an interval of values having a length below a first threshold; or lies between 60° and 85° or between 95° and 120° for the coverage of a zone of latitude below at most -55° combined with an additional zone of latitudes above at least -55° and of longitudes lying within an interval of values having a length below a second threshold; and - the longitude of the ascending node is defined as a function of the additional zone, such that it lies within an interval of values centred on the average longitude of the additional zone and having a length less than 80°. - the inclination of the plane of the orbit in relation to the equatorial plane lies between 55° and 65°; - the eccentricity of the orbit lies between 0.2 and 0.3; - the major half-axis of the orbit is set so as to obtain a geosynchronous orbit; and - the two main satellites having a right ascension difference of the ascending node of 180° and with a true anomaly difference of 180°; - the system being characterized in that the two orbits verify the following characteristics: - the argument of the perigee lies between 240° and 265° or between 275° and 300° for the coverage of a zone of latitude above at least 55° combined with an additional zone of latitudes below at most 55° and of longitudes lying within an interval of values having a length below a first threshold; or lies between 60° and 85° or between 95° and 120° for the coverage of a zone of latitude below at most -55° combined with an additional zone of latitudes above at least -55° and of longitudes lying within an interval of values having a length below a second threshold; and - the longitude of the ascending node is defined as a function of the additional zone, such that it lies within an interval of values centred on the average longitude of the additional zone and having a length less than 80°. - the argument of the perigee lies between 240° and 265° or between 275° and 300° for the coverage of a zone of latitude above at least 55° combined with an additional zone of latitudes below at most 55° and of longitudes lying within an interval of values having a length below a first threshold; or lies between 60° and 85° or between 95° and 120° for the coverage of a zone of latitude below at most -55° combined with an additional zone of latitudes above at least -55° and of longitudes lying within an interval of values having a length below a second threshold; and - the longitude of the ascending node is defined as a function of the additional zone, such that it lies within an interval of values centred on the average longitude of the additional zone and having a length less than 80°.