Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/17/2019   22:39:13   (  -0.00,-137.18) (   0.01,-137.08)   10.76                80
 05/20/2019   10:41:51   (   0.00,-137.19) (   0.10,-137.73)   60.55                80
 05/21/2019   10:20:16   (  -0.00,-137.18) (  -0.88,-133.15)  459.19                80
 05/22/2019   22:41:57   (   0.01,-137.14) (  -0.30,-138.39)  143.77                80
 05/23/2019   22:25:43   (   0.01,-137.13) (   0.74,-133.83)  375.99                80
 05/25/2019   10:47:15   (  -0.02,-137.14) (   0.40,-139.04)  216.09                80
 05/26/2019   10:25:40   (  -0.02,-137.13) (  -0.64,-134.47)  303.16                80
 05/27/2019   22:47:21   (   0.02,-137.07) (  -0.60,-139.70)  301.06                80
 05/28/2019   22:31:06   (   0.02,-137.05) (   0.44,-135.14)  218.26                80