Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 28.  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)
 07/28/2023   22:28:49   (  -0.00,-137.01) (   0.20,-135.99)  114.85                80
 07/30/2023   10:50:35   (   0.01,-137.00) (   0.97,-141.26)  485.36                80
 07/31/2023   10:29:09   (   0.01,-136.99) (  -0.06,-136.73)   30.62                80
 08/02/2023   22:32:18   (  -0.02,-136.96) (  -0.11,-137.49)   59.85                80
 08/03/2023   22:16:12   (  -0.02,-136.95) (   0.86,-132.95)  455.94                80
 08/05/2023   10:37:58   (   0.02,-136.94) (   0.30,-138.22)  145.09                80
 08/06/2023   10:16:33   (   0.02,-136.93) (  -0.73,-133.69)  370.38                80
 08/07/2023   22:38:26   (  -0.03,-136.90) (  -0.52,-138.97)  236.43                80
 08/08/2023   22:22:20   (  -0.03,-136.89) (   0.52,-134.44)  278.79                80
 08/10/2023   10:44:07   (   0.03,-136.87) (   0.65,-139.71)  323.18                80
 08/11/2023   10:22:40   (   0.03,-136.85) (  -0.33,-135.17)  191.54                80