Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 4 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)
 04/20/2019   22:47:24   (  -0.00,-137.19) (  -0.53,-139.66)  281.86                80
 04/21/2019   22:31:08   (   0.00,-137.18) (   0.44,-135.08)  238.75                80
 04/23/2019   10:52:41   (  -0.00,-137.19) (   0.68,-140.30)  354.14                80
 04/24/2019   10:31:07   (  -0.01,-137.18) (  -0.35,-135.74)  165.54                80
 04/25/2019   22:52:47   (   0.01,-137.15) (  -0.85,-140.97)  436.17                80
 04/26/2019   22:36:33   (   0.01,-137.14) (   0.18,-136.41)   83.66                80
 04/29/2019   10:36:31   (  -0.01,-137.13) (  -0.03,-137.05)    9.97                80
 05/01/2019   22:39:16   (   0.01,-137.07) (  -0.14,-137.72)   73.84                80
 05/02/2019   22:23:02   (   0.02,-137.06) (   0.89,-133.15)  445.36                80