Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 3.  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   11:02:44   (  -0.01,-137.20) (   0.63,-140.14)  334.33                80
 12/04/2021   10:47:01   (  -0.00,-137.20) (  -0.36,-135.70)  172.18                80
 12/05/2021   23:06:51   (   0.00,-137.19) (  -0.90,-141.12)  448.48                80
 12/06/2021   22:51:09   (  -0.00,-137.18) (   0.09,-136.67)   57.57                80
 12/09/2021   10:52:28   (   0.00,-137.16) (   0.10,-137.62)   52.41                80
 12/10/2021   10:36:45   (   0.00,-137.15) (  -0.89,-133.17)  453.38                80
 12/11/2021   22:56:37   (  -0.00,-137.13) (  -0.30,-138.61)  167.83                80
 12/12/2021   22:40:53   (  -0.00,-137.12) (   0.64,-134.15)  337.97                80
 12/14/2021   11:00:34   (   0.00,-137.11) (   0.55,-139.55)  278.24                80
 12/15/2021   10:44:52   (   0.00,-137.09) (  -0.44,-135.10)  227.14                80
 12/16/2021   23:04:42   (  -0.00,-137.06) (  -0.80,-140.52)  395.03                80