Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2021   18:34:57   (   0.04, -75.20) (   0.19, -74.42)   87.94                80
 04/18/2021   06:34:48   (  -0.03, -75.19) (  -0.05, -75.01)   20.20                80
 04/20/2021   18:37:27   (   0.03, -75.18) (  -0.08, -75.64)   52.67                80
 04/21/2021   18:21:09   (   0.02, -75.18) (   0.95, -71.05)  470.22                80
 04/23/2021   06:42:38   (  -0.02, -75.19) (   0.23, -76.23)  118.93                80
 04/24/2021   06:21:00   (  -0.02, -75.19) (  -0.80, -71.64)  404.11                80
 04/25/2021   18:42:36   (   0.02, -75.18) (  -0.34, -76.86)  190.25                80
 04/26/2021   18:26:19   (   0.02, -75.19) (   0.69, -72.27)  333.20                80
 04/28/2021   06:47:47   (  -0.02, -75.21) (   0.49, -77.45)  255.07                80