Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NOAA-21
TLE Epoch: 2023 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2023   18:37:59   (   0.02, -75.20) (  -0.76, -78.72)  400.97                80
 05/22/2023   18:21:54   (   0.02, -75.20) (   0.25, -74.19)  115.59                80
 05/24/2023   06:41:03   (  -0.03, -75.21) (   0.91, -79.47)  484.25                80
 05/25/2023   06:24:58   (  -0.03, -75.22) (  -0.11, -74.94)   32.85                80
 05/27/2023   18:25:30   (   0.03, -75.25) (  -0.08, -75.71)   53.12                80
 05/28/2023   18:09:26   (   0.03, -75.26) (   0.93, -71.18)  464.65                80
 05/30/2023   06:28:34   (  -0.03, -75.29) (   0.21, -76.46)  133.54                80
 05/31/2023   06:12:30   (  -0.03, -75.30) (  -0.81, -71.94)  384.51                80
 06/01/2023   18:31:46   (   0.04, -75.33) (  -0.38, -77.24)  217.82                80
 06/02/2023   18:15:41   (   0.04, -75.35) (   0.64, -72.71)  300.30                80