Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/21/2021   10:50:57   (  -0.03,-137.21) (   0.35,-138.85)  187.33                80
 01/22/2021   10:29:20   (  -0.02,-137.20) (  -0.71,-134.27)  334.36                80
 01/23/2021   22:50:56   (   0.01,-137.19) (  -0.52,-139.48)  261.35                80
 01/24/2021   22:34:39   (  -0.02,-137.17) (   0.48,-134.89)  260.30                80
 01/26/2021   10:56:07   (   0.01,-137.14) (   0.68,-140.07)  333.74                80
 01/27/2021   10:34:31   (   0.01,-137.12) (  -0.38,-135.49)  186.78                80
 01/28/2021   22:56:08   (  -0.01,-137.10) (  -0.79,-140.71)  411.05                80
 01/29/2021   22:39:51   (  -0.01,-137.07) (   0.21,-136.12)  109.18                80
 01/31/2021   11:01:19   (   0.01,-137.03) (   0.95,-141.30)  485.75                80
 02/01/2021   10:39:41   (   0.01,-137.01) (  -0.06,-136.71)   34.16                80