Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/14/2019   22:39:03   (   0.02,-137.18) (  -0.11,-137.76)   66.11                80
 07/15/2019   22:22:49   (   0.02,-137.18) (   0.94,-133.20)  454.61                80
 07/17/2019   10:44:21   (  -0.03,-137.19) (   0.22,-138.41)  137.80                80
 07/18/2019   10:22:46   (  -0.02,-137.19) (  -0.76,-133.83)  382.56                80
 07/19/2019   22:44:26   (   0.03,-137.15) (  -0.40,-139.07)  218.26                80
 07/20/2019   22:28:11   (   0.03,-137.15) (   0.59,-134.49)  302.06                80
 07/22/2019   10:47:04   (  -0.03,-137.16) (   0.52,-139.71)  290.89                80
 07/23/2019   10:30:48   (  -0.03,-137.14) (  -0.47,-135.13)  229.00                80
 07/24/2019   22:49:49   (   0.03,-137.10) (  -0.68,-140.38)  372.99                80
 07/25/2019   22:33:33   (   0.03,-137.09) (   0.31,-135.80)  146.56                80
 07/27/2019   10:52:26   (  -0.04,-137.08) (   0.81,-141.02)  447.65                80