Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 3 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)
 03/28/2023   22:17:25   (  -0.00,-137.00) (   0.88,-133.07)  448.30                80
 03/30/2023   10:36:30   (   0.01,-137.01) (   0.33,-138.32)  150.10                80
 03/31/2023   10:20:25   (   0.01,-137.01) (  -0.72,-133.80)  366.67                80
 04/01/2023   22:39:39   (  -0.02,-136.99) (  -0.47,-139.09)  239.30                80
 04/02/2023   22:23:32   (  -0.02,-136.99) (   0.52,-134.55)  277.36                80
 04/04/2023   10:45:18   (   0.01,-137.00) (   0.67,-139.81)  321.88                80
 04/05/2023   10:23:52   (  -0.00,-136.99) (  -0.38,-135.29)  194.05                80
 04/06/2023   22:48:27   (   0.02,-136.96) (  -0.78,-140.59)  413.23                80
 04/07/2023   22:29:40   (   0.03,-136.95) (   0.22,-136.05)  102.33                80
 04/09/2023   10:48:45   (  -0.03,-136.94) (   0.96,-141.31)  498.09                80
 04/10/2023   10:32:39   (  -0.03,-136.93) (  -0.04,-136.77)   17.16                80