Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 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)
 04/17/2023   22:41:53   (  -0.00,-137.00) (  -0.46,-139.02)  230.19                80
 04/18/2023   22:20:26   (  -0.00,-137.00) (   0.56,-134.48)  287.13                80
 04/20/2023   10:44:51   (   0.00,-137.01) (   0.59,-139.75)  311.30                80
 04/21/2023   10:23:24   (   0.00,-137.01) (  -0.38,-135.20)  205.68                80
 04/22/2023   22:47:57   (  -0.01,-136.99) (  -0.80,-140.49)  399.29                80
 04/23/2023   22:26:31   (  -0.01,-136.99) (   0.22,-135.96)  117.47                80
 04/25/2023   10:48:15   (   0.02,-136.99) (   0.97,-141.21)  481.90                80
 04/26/2023   10:32:09   (   0.02,-136.98) (  -0.06,-136.68)   34.42                80
 04/28/2023   22:32:34   (  -0.03,-136.94) (  -0.12,-137.43)   55.49                80
 04/29/2023   22:16:27   (  -0.03,-136.93) (   0.86,-132.88)  460.63                80
 05/01/2023   10:35:31   (   0.03,-136.92) (   0.31,-138.14)  139.73                80