Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/19/2021   18:45:53   (   0.01, -75.19) (  -0.15, -75.89)   80.15                80
 12/20/2021   18:30:10   (   0.01, -75.19) (   0.85, -71.45)  426.48                80
 12/22/2021   06:52:32   (  -0.01, -75.19) (   0.35, -76.84)  188.45                80
 12/23/2021   06:31:29   (  -0.00, -75.18) (  -0.65, -72.39)  318.32                80
 12/24/2021   18:53:59   (   0.01, -75.18) (  -0.59, -77.82)  300.88                80
 12/25/2021   18:38:17   (   0.01, -75.19) (   0.41, -73.37)  206.39                80
 12/27/2021   07:00:38   (  -0.01, -75.20) (   0.79, -78.77)  407.22                80
 12/28/2021   06:39:36   (  -0.01, -75.20) (  -0.21, -74.32)  100.22                80
 12/30/2021   18:43:44   (  -0.00, -75.21) (  -0.01, -75.30)   10.52                80
 12/31/2021   18:28:01   (  -0.01, -75.22) (   0.99, -70.86)  497.27                80