Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 22.  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)
 12/23/2023   08:31:50   (   0.02,-104.70) (   0.48,-106.71)  229.13                80
 12/24/2023   08:10:26   (   0.02,-104.70) (  -0.55,-102.18)  287.19                80
 12/25/2023   20:32:22   (  -0.02,-104.67) (  -0.63,-107.48)  320.19                80
 12/26/2023   20:16:17   (  -0.02,-104.67) (   0.34,-102.94)  196.43                80
 12/28/2023   08:38:05   (   0.02,-104.70) (   0.80,-108.22)  400.61                80
 12/29/2023   08:16:40   (   0.01,-104.70) (  -0.23,-103.69)  115.77                80
 12/30/2023   20:38:36   (  -0.01,-104.67) (  -0.98,-108.98)  491.65                80
 12/31/2023   20:22:31   (   0.00,-104.68) (   0.05,-104.45)   25.19                80
 01/03/2024   08:25:34   (  -0.01,-104.72) (   0.10,-105.19)   53.89                80
 01/04/2024   08:04:10   (  -0.01,-104.72) (  -0.95,-100.67)  462.95                80