Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/02/2021   22:45:09   (   0.04,-137.20) (   0.08,-137.04)   18.58                80
 04/05/2021   10:47:40   (  -0.03,-137.17) (   0.07,-137.63)   52.13                80
 04/06/2021   10:26:02   (  -0.03,-137.16) (  -0.95,-133.04)  469.57                80
 04/07/2021   22:47:39   (   0.02,-137.15) (  -0.21,-138.25)  125.39                80
 04/08/2021   22:31:21   (   0.02,-137.14) (   0.81,-133.66)  396.35                80
 04/10/2021   10:52:49   (  -0.02,-137.12) (   0.37,-138.84)  196.66                80
 04/11/2021   10:31:12   (  -0.02,-137.10) (  -0.65,-134.25)  324.68                80
 04/12/2021   22:52:48   (   0.02,-137.09) (  -0.50,-139.47)  271.18                80
 04/13/2021   22:36:31   (   0.02,-137.07) (   0.52,-134.88)  249.91                80
 04/15/2021   10:57:59   (  -0.02,-137.04) (   0.66,-140.06)  344.18                80