Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 9 21.  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)
 09/23/2023   08:37:18   (   0.00,-104.71) (   0.72,-108.04)  378.80                80
 09/24/2023   08:15:53   (   0.00,-104.71) (  -0.25,-103.50)  137.26                80
 09/25/2023   20:37:49   (  -0.01,-104.67) (  -0.94,-108.80)  470.89                80
 09/26/2023   20:21:45   (  -0.01,-104.67) (   0.09,-104.28)   45.56                80
 09/29/2023   08:24:48   (   0.01,-104.71) (   0.06,-105.02)   34.91                80
 09/30/2023   08:03:22   (   0.01,-104.71) (  -0.92,-100.48)  481.61                80
 10/01/2023   20:25:18   (  -0.01,-104.68) (  -0.25,-105.79)  126.14                80
 10/02/2023   20:09:13   (  -0.01,-104.68) (   0.73,-101.25)  390.55                80
 10/04/2023   08:31:00   (   0.01,-104.72) (   0.43,-106.52)  205.95                80
 10/05/2023   08:09:36   (   0.02,-104.71) (  -0.61,-101.99)  310.52                80