Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 3 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/21/2020   10:49:21   (   0.00,-137.21) (   0.51,-139.53)  264.19                80
 03/22/2020   10:27:46   (  -0.00,-137.21) (  -0.53,-134.95)  257.83                80
 03/23/2020   22:49:24   (   0.00,-137.21) (  -0.67,-140.18)  337.91                80
 03/24/2020   22:33:08   (   0.00,-137.21) (   0.38,-135.60)  184.07                80
 03/26/2020   10:54:39   (  -0.00,-137.22) (   0.82,-140.79)  408.19                80
 03/27/2020   10:33:03   (  -0.00,-137.21) (  -0.23,-136.22)  113.21                80
 03/28/2020   22:54:42   (   0.00,-137.20) (  -0.96,-141.45)  483.92                80
 03/29/2020   22:38:26   (   0.00,-137.20) (   0.08,-136.87)   37.11                80
 04/01/2020   10:41:01   (  -0.00,-137.17) (   0.07,-137.49)   36.32                80
 04/02/2020   10:19:25   (  -0.00,-137.16) (  -0.98,-132.92)  483.74                80
 04/03/2020   22:41:04   (   0.00,-137.13) (  -0.20,-138.14)  115.42                80