When ERS-2 was launched ERS-1 shared the same orbital plane allowing a Tandem mission, with ERS-2 passing the same point on the ground 1 day later than ERS-1.
This allowed a tandem mission, with ERS-2 passing the same point on the ground 1 day later than ERS-1. When ERS-2 was launched, ERS-1 shared the same orbital plane.
When ERS-2 was launched, ERS-1 shared the same orbital plane. This allowed a tandem mission, with ERS-2 passing the same point on the ground 1 day later than ERS-1.
When ERS-2 was launched, ERS-1 shared the same orbital plane. This allowed a tandem mission, with ERS-2 passing the same point on the ground 1 day later than ERS-1.