Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 17.  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)
 06/18/2023   10:35:54   (  -0.02,-137.00) (   0.30,-138.31)  149.80                80
 06/19/2023   10:19:50   (  -0.02,-136.99) (  -0.74,-133.78)  365.99                80
 06/20/2023   22:39:06   (   0.01,-136.98) (  -0.43,-139.09)  240.51                80
 06/21/2023   22:23:01   (   0.00,-136.97) (   0.55,-134.55)  275.19                80
 06/23/2023   10:42:07   (   0.00,-136.96) (   0.67,-139.81)  326.07                80
 06/24/2023   10:26:03   (   0.01,-136.95) (  -0.38,-135.29)  189.41                80
 06/25/2023   22:45:18   (  -0.01,-136.92) (  -0.84,-140.59)  417.76                80
 06/26/2023   22:29:13   (  -0.01,-136.91) (   0.21,-136.06)   97.40                80
 06/29/2023   10:32:15   (   0.01,-136.87) (  -0.04,-136.80)    9.85                80