Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 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)
 12/18/2019   10:26:43   (   0.01,-137.22) (  -0.52,-134.83)  272.21                80
 12/19/2019   22:51:02   (  -0.01,-137.22) (  -0.64,-140.06)  324.56                80
 12/20/2019   22:29:27   (  -0.01,-137.21) (   0.38,-135.49)  196.56                80
 12/22/2019   10:53:38   (   0.01,-137.21) (   0.80,-140.69)  396.75                80
 12/23/2019   10:32:03   (   0.01,-137.20) (  -0.22,-136.11)  123.94                80
 12/24/2019   22:56:22   (  -0.02,-137.19) (  -0.94,-141.35)  474.00                80
 12/25/2019   22:34:47   (  -0.02,-137.18) (   0.08,-136.77)   46.32                80
 12/28/2019   10:40:02   (   0.02,-137.15) (   0.07,-137.40)   28.08                80
 12/29/2019   10:18:27   (   0.01,-137.14) (  -0.95,-132.82)  491.74                80
 12/30/2019   22:42:46   (  -0.02,-137.11) (  -0.22,-138.06)  107.24                80
 12/31/2019   22:21:11   (  -0.01,-137.10) (   0.81,-133.48)  412.49                80