Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 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)
 04/26/2023   10:32:09   (   0.00,-137.00) (  -0.06,-136.68)   36.77                80
 04/28/2023   22:32:35   (  -0.00,-136.99) (  -0.08,-137.44)   50.18                80
 04/29/2023   22:16:28   (  -0.00,-136.99) (   0.90,-132.89)  466.99                80
 05/01/2023   10:38:12   (   0.00,-137.00) (   0.28,-138.15)  131.95                80
 05/02/2023   10:16:46   (   0.00,-136.99) (  -0.76,-133.62)  384.96                80
 05/03/2023   22:38:38   (   0.00,-136.98) (  -0.45,-138.90)  219.93                80
 05/04/2023   22:22:32   (   0.00,-136.97) (   0.60,-134.37)  296.54                80
 05/06/2023   10:41:36   (  -0.00,-136.96) (   0.57,-139.63)  303.80                80
 05/07/2023   10:25:28   (  -0.01,-136.94) (  -0.42,-135.08)  211.89                80
 05/08/2023   22:44:41   (   0.02,-136.91) (  -0.77,-140.37)  395.09                80