Likely answer edit

Off-nadir coverage math (know the numbers):

  • The tilted view lets SPOT image any point within a ~900 km swath on either side of the ground track.
  • Equator: a given point can be imaged 7 times per 26-day cycle.
  • Latitude 45°: 11 times per cycle → about 157 times per year, average 2.4 days between views (minimum 1 day, maximum 4).
  • With all three SPOTs flying, 95% of Earth was imageable every day.