A dawn-dusk orbit is a type of sun-synchronous orbit that allows a satellite to be permanently bathed in sunlight. This allows
the satellite to be powered almost entirely by its solar panels. RADARSAT-1,
for example, travels in a dawn-dusk orbit with an altitude of 798 km, period
of 100.7 minutes, and inclination of 98.6°.
|Dawn-dusk orbit of RADARSAT-1