Simultaneous Nadir Overpasses (SNOs) between GOES-16 and NOAA-21
TLE Epoch: 2023 4 18.  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)
 04/19/2023   18:40:40   (   0.03, -75.20) (  -0.76, -78.67)  396.15                80
 04/20/2023   18:19:14   (   0.04, -75.20) (   0.26, -74.14)  120.89                80
 04/22/2023   06:43:39   (  -0.03, -75.21) (   0.88, -79.40)  477.93                80
 04/23/2023   06:22:12   (  -0.04, -75.21) (  -0.09, -74.86)   39.42                80
 04/25/2023   18:27:59   (   0.03, -75.21) (  -0.06, -75.62)   46.28                80
 04/26/2023   18:06:32   (   0.03, -75.22) (   0.97, -71.08)  471.58                80
 04/28/2023   06:30:56   (  -0.02, -75.23) (   0.21, -76.34)  125.85                80
 04/29/2023   06:09:29   (  -0.02, -75.24) (  -0.77, -71.79)  392.46                80
 04/30/2023   18:34:02   (   0.01, -75.25) (  -0.38, -77.09)  209.16                80
 05/01/2023   18:12:35   (   0.01, -75.27) (   0.60, -72.55)  309.66                80