Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/27/2021   10:34:31   (  -0.00,-137.23) (  -0.38,-135.49)  197.92                80
 01/28/2021   22:56:08   (   0.01,-137.23) (  -0.80,-140.70)  396.09                80
 01/29/2021   22:39:51   (   0.01,-137.24) (   0.27,-136.13)  127.39                80
 01/31/2021   11:01:20   (  -0.01,-137.26) (   0.89,-141.31)  461.40                80
 02/01/2021   10:39:42   (  -0.01,-137.26) (  -0.11,-136.72)   61.76                80
 02/03/2021   22:42:23   (   0.01,-137.26) (  -0.00,-137.36)   10.59                80
 02/06/2021   10:47:34   (  -0.02,-137.26) (   0.15,-137.95)   78.36                80
 02/07/2021   10:25:57   (  -0.02,-137.26) (  -0.92,-133.37)  443.56                80
 02/08/2021   22:47:35   (   0.03,-137.24) (  -0.26,-138.59)  153.46                80
 02/09/2021   22:31:17   (   0.03,-137.23) (   0.75,-134.00)  368.31                80