Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/03/2021   11:02:43   (  -0.01,-137.20) (   0.63,-140.14)  334.44                80
 12/04/2021   10:47:01   (  -0.00,-137.20) (  -0.36,-135.69)  171.99                80
 12/05/2021   23:06:51   (   0.00,-137.18) (  -0.91,-141.12)  448.79                80
 12/06/2021   22:51:09   (  -0.00,-137.18) (   0.08,-136.67)   57.24                80
 12/09/2021   10:52:28   (   0.00,-137.15) (   0.12,-137.62)   52.94                80
 12/10/2021   10:36:45   (   0.00,-137.14) (  -0.88,-133.17)  452.79                80
 12/11/2021   22:56:36   (  -0.00,-137.13) (  -0.32,-138.61)  168.54                80
 12/12/2021   22:40:54   (  -0.00,-137.11) (   0.68,-134.16)  337.16                80
 12/14/2021   11:00:34   (   0.00,-137.10) (   0.58,-139.54)  279.13                80
 12/15/2021   10:44:52   (   0.00,-137.08) (  -0.42,-135.10)  226.20                80