Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/23/2021   22:50:57   (   0.02,-137.20) (  -0.47,-139.49)  260.57                80
 01/24/2021   22:34:40   (   0.01,-137.19) (   0.53,-134.90)  261.22                80
 01/26/2021   10:56:07   (   0.02,-137.17) (   0.69,-140.06)  331.00                80
 01/27/2021   10:34:31   (   0.01,-137.15) (  -0.37,-135.49)  189.73                80
 01/28/2021   22:56:08   (  -0.01,-137.12) (  -0.80,-140.70)  408.41                80
 01/29/2021   22:39:50   (  -0.01,-137.10) (   0.20,-136.11)  112.08                80
 01/31/2021   11:01:19   (   0.01,-137.07) (   0.96,-141.29)  481.68                80
 02/01/2021   10:39:41   (   0.01,-137.05) (  -0.04,-136.70)   38.53                80
 02/03/2021   22:42:22   (  -0.01,-136.98) (  -0.07,-137.34)   41.04                80
 02/04/2021   22:26:05   (  -0.01,-136.95) (   0.93,-132.75)  478.63                80