Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 1 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 01/30/2023   09:04:42   (   0.03,-116.02) (  -0.25,-114.65)  156.46                80
 02/01/2023   21:05:01   (  -0.04,-113.11) (  -0.50,-115.29)  247.67                80
 02/02/2023   20:48:51   (  -0.04,-111.95) (   0.22,-110.69)  143.64                80
 02/05/2023   08:49:02   (   0.05,-109.03) (   0.53,-111.30)  257.28                80
 02/06/2023   08:32:51   (   0.05,-107.88) (  -0.20,-106.70)  134.00                80
 02/08/2023   20:33:10   (  -0.06,-104.96) (  -0.59,-107.33)  270.15                80
 02/09/2023   20:17:01   (  -0.06,-103.81) (   0.20,-102.75)  121.32                80
 02/12/2023   08:17:10   (   0.06,-100.89) (   0.59,-103.34)  278.99                80