Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 14.  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)
 09/14/2023   22:28:39   (   0.00,-137.01) (   0.24,-136.02)  113.26                80
 09/16/2023   10:50:27   (  -0.00,-137.01) (   0.98,-141.28)  487.51                80
 09/17/2023   10:29:02   (  -0.00,-137.00) (  -0.04,-136.75)   28.52                80
 09/19/2023   22:32:15   (   0.01,-136.99) (  -0.09,-137.54)   62.17                80
 09/20/2023   22:16:10   (   0.01,-136.98) (   0.88,-133.00)  452.99                80
 09/22/2023   10:35:18   (  -0.02,-136.96) (   0.26,-138.27)  149.99                80
 09/23/2023   10:19:13   (  -0.02,-136.94) (  -0.76,-133.75)  364.44                80
 09/24/2023   22:38:30   (   0.03,-136.91) (  -0.43,-139.05)  243.67                80
 09/25/2023   22:22:24   (   0.03,-136.89) (   0.55,-134.51)  270.57                80
 09/27/2023   10:41:32   (  -0.03,-136.86) (   0.64,-139.78)  333.13                80