Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 5.  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   10:47:39   (  -0.04,-137.21) (   0.08,-137.63)   47.90                80
 04/06/2021   10:26:03   (  -0.04,-137.21) (  -1.00,-133.05)  474.95                80
 04/07/2021   22:50:18   (   0.03,-137.22) (  -0.22,-138.25)  118.36                80
 04/08/2021   22:31:21   (   0.03,-137.22) (   0.80,-133.66)  404.47                80
 04/10/2021   10:52:49   (  -0.03,-137.21) (   0.37,-138.84)  186.95                80
 04/11/2021   10:31:13   (  -0.03,-137.20) (  -0.71,-134.26)  335.51                80
 04/12/2021   22:52:48   (   0.03,-137.20) (  -0.50,-139.47)  258.66                80
 04/13/2021   22:36:30   (   0.03,-137.19) (   0.52,-134.88)  263.51                80
 04/15/2021   10:57:59   (  -0.03,-137.18) (   0.65,-140.06)  329.00                80
 04/16/2021   10:36:22   (  -0.03,-137.16) (  -0.43,-135.48)  192.58                80
 04/17/2021   22:57:58   (   0.02,-137.15) (  -0.77,-140.68)  403.13                80
 04/18/2021   22:41:40   (   0.02,-137.13) (   0.25,-136.09)  118.08                80