Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/08/2021   22:31:21   (   0.03,-137.21) (   0.85,-133.67)  404.15                80
 04/10/2021   10:52:50   (  -0.03,-137.20) (   0.32,-138.85)  187.69                80
 04/11/2021   10:31:12   (  -0.03,-137.19) (  -0.70,-134.26)  334.60                80
 04/12/2021   22:52:48   (   0.03,-137.19) (  -0.51,-139.46)  259.63                80
 04/13/2021   22:36:31   (   0.03,-137.18) (   0.57,-134.89)  262.39                80
 04/15/2021   10:57:59   (  -0.03,-137.16) (   0.60,-140.07)  330.57                80
 04/16/2021   10:36:22   (  -0.03,-137.15) (  -0.43,-135.48)  190.86                80
 04/17/2021   22:57:57   (   0.02,-137.13) (  -0.78,-140.68)  404.90                80
 04/18/2021   22:41:40   (   0.02,-137.11) (   0.25,-136.09)  116.16                80
 04/20/2021   11:03:08   (  -0.01,-137.08) (   0.92,-141.27)  478.04                80
 04/21/2021   10:41:31   (  -0.01,-137.05) (  -0.10,-136.68)   42.54                80