Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2021   06:52:00   (  -0.01, -75.19) (   0.49, -77.43)  255.15                80
 12/12/2021   06:36:17   (  -0.01, -75.20) (  -0.51, -72.98)  252.62                80
 12/13/2021   18:56:09   (   0.01, -75.21) (  -0.69, -78.42)  364.77                80
 12/14/2021   18:40:26   (   0.01, -75.23) (   0.30, -73.97)  143.52                80
 12/16/2021   07:02:46   (  -0.01, -75.25) (   0.95, -79.35)  468.92                80
 12/17/2021   06:44:25   (  -0.00, -75.26) (  -0.11, -74.92)   39.60                80
 12/19/2021   18:45:53   (  -0.01, -75.30) (  -0.14, -75.90)   68.55                80
 12/20/2021   18:30:10   (  -0.01, -75.31) (   0.86, -71.45)  440.19                80
 12/22/2021   06:52:32   (   0.01, -75.34) (   0.34, -76.85)  171.42                80
 12/23/2021   06:31:29   (   0.01, -75.36) (  -0.66, -72.40)  337.45                80