Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/24/2021   22:34:40   (   0.03,-137.23) (   0.53,-134.90)  265.11                80
 01/26/2021   10:56:08   (  -0.03,-137.23) (   0.63,-140.08)  325.26                80
 01/27/2021   10:34:32   (  -0.02,-137.22) (  -0.43,-135.50)  197.12                80
 01/28/2021   22:56:08   (  -0.01,-137.21) (  -0.80,-140.70)  398.45                80
 01/29/2021   22:39:51   (  -0.01,-137.20) (   0.26,-136.13)  123.39                80
 01/31/2021   11:01:20   (   0.00,-137.20) (   0.90,-141.31)  468.09                80
 02/01/2021   10:39:42   (  -0.00,-137.18) (  -0.11,-136.72)   53.29                80
 02/03/2021   22:42:22   (   0.01,-137.15) (  -0.06,-137.34)   23.13                80
 02/04/2021   22:26:06   (   0.01,-137.13) (   1.01,-132.77)  498.04                80
 02/06/2021   10:47:33   (   0.01,-137.11) (   0.20,-137.94)   94.46                80