Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2021   11:06:34   (  -0.02,-137.22) (   0.82,-140.88)  418.44                80
 12/31/2021   10:50:51   (  -0.01,-137.21) (  -0.18,-136.44)   88.22                80
 01/02/2022   22:52:19   (  -0.00,-137.19) (  -0.03,-137.42)   25.81                80
 01/03/2022   22:36:35   (  -0.01,-137.18) (   0.92,-132.96)  480.45                80
 01/05/2022   10:56:17   (   0.01,-137.17) (   0.29,-138.35)  135.44                80
 01/06/2022   10:40:34   (   0.01,-137.16) (  -0.72,-133.91)  370.39                80
 01/07/2022   23:00:25   (  -0.01,-137.14) (  -0.48,-139.34)  250.53                80
 01/08/2022   22:44:41   (  -0.00,-137.13) (   0.48,-134.88)  255.29                80
 01/10/2022   11:04:22   (   0.00,-137.11) (   0.74,-140.27)  360.95                80
 01/11/2022   10:48:40   (   0.01,-137.10) (  -0.27,-135.83)  144.58                80