Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 13.  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)
 09/13/2023   22:44:43   (   0.01,-137.01) (  -0.80,-140.54)  403.12                80
 09/14/2023   22:28:39   (   0.01,-137.01) (   0.21,-136.01)  113.21                80
 09/16/2023   10:50:27   (  -0.01,-137.01) (   0.94,-141.29)  487.62                80
 09/17/2023   10:29:03   (  -0.00,-137.00) (  -0.07,-136.76)   28.32                80
 09/19/2023   22:32:15   (   0.01,-136.99) (  -0.12,-137.53)   62.22                80
 09/20/2023   22:16:10   (   0.01,-136.98) (   0.90,-133.00)  452.84                80
 09/22/2023   10:35:17   (  -0.02,-136.96) (   0.30,-138.27)  150.22                80
 09/23/2023   10:19:13   (  -0.02,-136.94) (  -0.73,-133.74)  364.19                80
 09/24/2023   22:38:29   (   0.03,-136.91) (  -0.46,-139.05)  243.88                80
 09/25/2023   22:22:25   (   0.03,-136.89) (   0.56,-134.52)  270.31                80