Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 3 20.  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)
 03/21/2023   22:46:07   (   0.00,-137.01) (  -0.83,-140.63)  413.81                80
 03/22/2023   22:30:01   (   0.00,-137.01) (   0.19,-136.10)  103.04                80
 03/24/2023   10:49:08   (  -0.00,-137.01) (   0.98,-141.37)  496.64                80
 03/25/2023   10:33:02   (  -0.00,-137.01) (  -0.04,-136.84)   19.77                80
 03/27/2023   22:33:31   (   0.00,-136.99) (  -0.13,-137.60)   69.75                80
 03/28/2023   22:17:25   (   0.00,-136.98) (   0.90,-133.07)  446.12                80
 03/30/2023   10:36:31   (  -0.00,-136.97) (   0.32,-138.33)  155.04                80
 03/31/2023   10:20:25   (  -0.00,-136.96) (  -0.71,-133.80)  360.57                80
 04/01/2023   22:39:40   (   0.01,-136.94) (  -0.48,-139.10)  246.03                80
 04/02/2023   22:23:34   (   0.01,-136.93) (   0.56,-134.57)  269.44                80