Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 6.  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)
 07/06/2023   22:38:58   (   0.02,-137.00) (  -0.43,-139.08)  236.06                80
 07/07/2023   22:22:53   (   0.02,-137.00) (   0.58,-134.54)  280.45                80
 07/09/2023   10:44:39   (  -0.02,-137.00) (   0.62,-139.80)  320.19                80
 07/10/2023   10:23:13   (  -0.02,-137.00) (  -0.38,-135.27)  196.04                80
 07/11/2023   22:45:10   (   0.03,-136.99) (  -0.75,-140.58)  409.22                80
 07/12/2023   22:29:04   (   0.03,-136.98) (   0.26,-136.05)  106.70                80
 07/14/2023   10:50:51   (  -0.03,-136.97) (   0.94,-141.31)  495.05                80
 07/15/2023   10:29:25   (  -0.04,-136.96) (  -0.07,-136.78)   20.28                80
 07/17/2023   22:32:35   (   0.04,-136.92) (  -0.09,-137.55)   71.16                80
 07/18/2023   22:16:29   (   0.04,-136.91) (   0.92,-133.02)  444.00                80