Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 19.  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)
 09/19/2023   22:32:15   (  -0.00,-137.01) (  -0.11,-137.53)   59.39                80
 09/20/2023   22:16:10   (  -0.01,-137.01) (   0.91,-133.00)  456.92                80
 09/22/2023   10:35:18   (   0.00,-137.01) (   0.28,-138.27)  143.57                80
 09/23/2023   10:19:13   (  -0.00,-137.00) (  -0.74,-133.74)  371.99                80
 09/24/2023   22:38:29   (   0.00,-136.98) (  -0.45,-139.05)  235.03                80
 09/25/2023   22:22:24   (   0.00,-136.97) (   0.52,-134.51)  280.39                80
 09/27/2023   10:44:12   (   0.00,-136.97) (   0.60,-139.79)  320.87                80
 09/28/2023   10:22:47   (   0.00,-136.95) (  -0.37,-135.25)  194.41                80
 09/29/2023   22:44:43   (  -0.00,-136.93) (  -0.80,-140.55)  413.00                80
 09/30/2023   22:28:38   (  -0.00,-136.92) (   0.17,-136.02)  102.07                80
 10/02/2023   10:47:45   (   0.00,-136.90) (   1.00,-141.28)  499.96                80