Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2021   10:44:53   (  -0.01,-137.21) (  -0.49,-135.11)  239.79                80
 12/16/2021   23:04:44   (   0.01,-137.20) (  -0.71,-140.54)  380.91                80
 12/17/2021   22:49:01   (   0.01,-137.19) (   0.22,-136.08)  125.35                80
 12/19/2021   11:08:42   (  -0.00,-137.18) (   0.97,-141.48)  490.06                80
 12/20/2021   10:53:00   (   0.00,-137.17) (  -0.02,-137.03)   15.57                80
 12/22/2021   22:54:28   (  -0.01,-137.12) (  -0.23,-138.01)  101.36                80
 12/23/2021   22:38:45   (  -0.01,-137.11) (   0.77,-133.56)  403.84                80
 12/25/2021   10:58:26   (   0.01,-137.09) (   0.44,-138.95)  212.93                80
 12/26/2021   10:40:04   (   0.01,-137.07) (  -0.56,-134.51)  291.84                80
 12/27/2021   23:02:34   (  -0.00,-137.03) (  -0.68,-139.93)  331.53                80
 12/28/2021   22:46:52   (  -0.01,-137.01) (   0.32,-135.49)  172.89                80