Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 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)
 04/21/2023   10:23:24   (   0.00,-137.01) (  -0.38,-135.20)  205.40                80
 04/22/2023   22:47:57   (  -0.00,-136.99) (  -0.81,-140.49)  400.02                80
 04/23/2023   22:26:31   (  -0.01,-136.98) (   0.22,-135.96)  116.46                80
 04/25/2023   10:48:15   (   0.02,-136.98) (   0.97,-141.21)  482.84                80
 04/26/2023   10:32:09   (   0.02,-136.97) (  -0.05,-136.68)   33.34                80
 04/28/2023   22:32:34   (  -0.03,-136.93) (  -0.14,-137.43)   57.08                80
 04/29/2023   22:16:28   (  -0.03,-136.91) (   0.90,-132.89)  458.84                80
 05/01/2023   10:35:32   (   0.03,-136.90) (   0.28,-138.15)  141.65                80
 05/02/2023   10:19:25   (   0.03,-136.89) (  -0.70,-133.60)  374.05                80
 05/03/2023   22:38:37   (  -0.03,-136.85) (  -0.51,-138.89)  233.21                80