Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/19/2021   22:29:28   (   0.00,-137.21) (   0.83,-133.67)  404.03                80
 01/21/2021   10:50:57   (  -0.01,-137.21) (   0.35,-138.85)  187.01                80
 01/22/2021   10:29:19   (  -0.01,-137.20) (  -0.65,-134.26)  335.09                80
 01/23/2021   22:50:56   (   0.01,-137.19) (  -0.52,-139.48)  260.89                80
 01/24/2021   22:34:40   (   0.01,-137.18) (   0.54,-134.90)  260.78                80
 01/26/2021   10:56:08   (  -0.02,-137.17) (   0.63,-140.08)  331.61                80
 01/27/2021   10:34:31   (  -0.02,-137.16) (  -0.38,-135.49)  189.49                80
 01/28/2021   22:56:08   (   0.02,-137.13) (  -0.80,-140.71)  408.10                80
 01/29/2021   22:39:52   (   0.02,-137.11) (   0.27,-136.13)  112.81                80
 01/31/2021   11:01:19   (  -0.02,-137.09) (   0.96,-141.30)  480.44                80
 02/01/2021   10:39:42   (  -0.02,-137.07) (  -0.11,-136.72)   40.09                80