Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2021   11:03:08   (  -0.02,-137.20) (   0.91,-141.27)  464.00                80
 04/21/2021   10:41:31   (  -0.02,-137.20) (  -0.12,-136.68)   59.07                80
 04/23/2021   22:46:50   (   0.02,-137.20) (  -0.00,-137.31)   12.60                80
 04/26/2021   10:49:21   (  -0.02,-137.19) (   0.14,-137.90)   80.54                80
 04/27/2021   10:27:43   (  -0.02,-137.18) (  -0.89,-133.31)  441.51                80
 04/28/2021   22:51:58   (   0.02,-137.16) (  -0.31,-138.51)  154.60                80
 04/29/2021   22:33:01   (   0.02,-137.15) (   0.72,-133.93)  367.03                80
 05/01/2021   10:54:29   (  -0.01,-137.14) (   0.45,-139.10)  225.06                80
 05/02/2021   10:32:52   (  -0.01,-137.12) (  -0.58,-134.52)  296.19                80
 05/03/2021   22:54:28   (   0.01,-137.09) (  -0.56,-139.73)  301.02                80