Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and METOP-B
TLE Epoch: 2023 8 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(METOP-B) METOP-B Lat/Lon    Distance(km)  Time Diff(sec)
 08/25/2023   03:46:07   (  72.01, 116.34) 08/25/2023   03:45:00  (  72.04, 113.86)   85.09                67
 08/25/2023   04:36:50   ( -71.97, -76.28) 08/25/2023   04:35:43  ( -71.98, -78.93)   91.16                67