Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 4.  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)
 06/04/2023   22:39:09   (   0.01,-136.99) (  -0.46,-139.08)  237.78                80
 06/05/2023   22:23:04   (   0.01,-136.98) (   0.56,-134.55)  277.89                80
 06/07/2023   10:42:12   (  -0.00,-136.98) (   0.63,-139.82)  323.51                80
 06/08/2023   10:26:07   (   0.01,-136.97) (  -0.40,-135.29)  191.82                80
 06/09/2023   22:45:23   (  -0.01,-136.94) (  -0.85,-140.58)  415.63                80
 06/10/2023   22:29:18   (  -0.01,-136.93) (   0.18,-136.05)   99.62                80
 06/13/2023   10:32:21   (   0.01,-136.91) (  -0.02,-136.80)   12.65                80
 06/15/2023   22:32:52   (  -0.00,-136.86) (  -0.18,-137.56)   81.40                80
 06/16/2023   22:16:47   (  -0.00,-136.84) (   0.85,-133.04)  432.96                80