Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2023   22:22:24   (   0.02,-136.98) (   0.54,-134.51)  281.32                80
 09/27/2023   10:44:12   (  -0.01,-136.98) (   0.64,-139.78)  319.61                80
 09/28/2023   10:22:47   (  -0.01,-136.97) (  -0.40,-135.25)  196.03                80
 09/29/2023   22:44:43   (   0.01,-136.95) (  -0.78,-140.56)  410.72                80
 09/30/2023   22:28:38   (   0.00,-136.94) (   0.20,-136.02)  104.69                80
 10/02/2023   10:47:45   (  -0.00,-136.93) (   0.96,-141.29)  496.92                80
 10/03/2023   10:31:40   (   0.01,-136.91) (  -0.03,-136.75)   18.29                80
 10/05/2023   22:32:11   (  -0.01,-136.86) (  -0.14,-137.52)   75.23                80
 10/06/2023   22:16:05   (  -0.01,-136.84) (   0.86,-132.99)  439.16                80
 10/08/2023   10:37:51   (   0.01,-136.82) (   0.35,-138.25)  163.72                80