Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2021   11:00:36   (  -0.02,-137.21) (   0.48,-139.56)  266.74                80
 12/15/2021   10:44:54   (  -0.01,-137.21) (  -0.51,-135.11)  239.94                80
 12/16/2021   23:04:44   (   0.01,-137.20) (  -0.74,-140.53)  380.72                80
 12/17/2021   22:49:01   (   0.00,-137.19) (   0.25,-136.09)  125.53                80
 12/19/2021   11:08:43   (  -0.00,-137.18) (   0.94,-141.48)  489.74                80
 12/20/2021   10:53:00   (   0.00,-137.17) (  -0.05,-137.04)   16.16                80
 12/22/2021   22:54:28   (  -0.01,-137.13) (  -0.20,-138.01)  100.83                80
 12/23/2021   22:38:46   (  -0.01,-137.11) (   0.80,-133.57)  404.38                80
 12/25/2021   10:58:27   (   0.01,-137.09) (   0.40,-138.96)  212.29                80
 12/26/2021   10:42:44   (   0.01,-137.07) (  -0.60,-134.51)  292.56                80
 12/27/2021   23:02:35   (  -0.00,-137.03) (  -0.63,-139.94)  330.74                80