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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/05/2021   10:47:40   (  -0.04,-137.21) (   0.05,-137.63)   47.70                80
 04/06/2021   10:26:02   (  -0.04,-137.21) (  -0.97,-133.04)  475.15                80
 04/07/2021   22:47:39   (   0.03,-137.22) (  -0.20,-138.26)  118.09                80
 04/08/2021   22:31:21   (   0.03,-137.22) (   0.83,-133.67)  404.78                80
 04/10/2021   10:52:50   (  -0.03,-137.21) (   0.34,-138.85)  186.41                80
 04/11/2021   10:31:12   (  -0.03,-137.21) (  -0.68,-134.26)  336.08                80
 04/12/2021   22:52:48   (   0.03,-137.21) (  -0.47,-139.47)  258.02                80
 04/13/2021   22:36:31   (   0.03,-137.20) (   0.55,-134.88)  264.22                80
 04/15/2021   10:57:59   (  -0.03,-137.18) (   0.62,-140.06)  328.08                80
 04/16/2021   10:36:22   (  -0.03,-137.17) (  -0.40,-135.47)  193.55                80
 04/17/2021   22:57:58   (   0.02,-137.16) (  -0.74,-140.69)  402.11                80