Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/18/2021   22:39:00   (   0.03,-137.18) (   0.26,-136.09)  123.59                80
 04/20/2021   11:03:08   (  -0.02,-137.17) (   0.92,-141.27)  468.17                80
 04/21/2021   10:41:31   (  -0.02,-137.15) (  -0.11,-136.68)   53.49                80
 04/23/2021   22:44:10   (   0.02,-137.12) (  -0.01,-137.31)   21.39                80
 04/24/2021   22:27:52   (   0.02,-137.10) (   1.02,-132.72)  499.88                80
 04/26/2021   10:49:21   (  -0.02,-137.08) (   0.16,-137.90)   93.24                80
 04/27/2021   10:27:43   (  -0.02,-137.06) (  -0.87,-133.31)  427.42                80
 04/28/2021   22:49:18   (   0.02,-137.02) (  -0.33,-138.51)  170.46                80
 04/29/2021   22:33:01   (   0.02,-136.99) (   0.70,-133.92)  349.74                80
 05/01/2021   10:54:29   (  -0.01,-136.96) (   0.48,-139.10)  244.87                80