Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 12 19.  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)
 12/19/2023   08:04:11   (   0.00,-104.69) (  -0.88,-100.67)  457.53                80
 12/20/2023   20:26:07   (  -0.00,-104.67) (  -0.31,-105.97)  149.30                80
 12/21/2023   20:10:03   (  -0.01,-104.67) (   0.71,-101.44)  367.46                80
 12/23/2023   08:31:51   (   0.01,-104.70) (   0.45,-106.72)  229.78                80
 12/24/2023   08:10:26   (   0.01,-104.70) (  -0.57,-102.19)  286.72                80
 12/25/2023   20:32:22   (  -0.02,-104.67) (  -0.66,-107.48)  320.52                80
 12/26/2023   20:16:17   (  -0.02,-104.67) (   0.36,-102.95)  196.17                80
 12/28/2023   08:38:05   (   0.02,-104.70) (   0.79,-108.22)  400.67                80
 12/29/2023   08:16:40   (   0.02,-104.70) (  -0.19,-103.68)  115.93                80
 12/30/2023   20:38:36   (  -0.03,-104.67) (  -0.98,-108.99)  491.17                80
 12/31/2023   20:22:31   (  -0.03,-104.68) (   0.00,-104.45)   25.96                80