Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 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)
 05/15/2021   22:27:56   (   0.02,-137.19) (   0.94,-132.97)  480.97                15
 05/17/2021   10:50:59   (  -0.01,-137.19) (   0.19,-138.15)  109.00                80
 05/18/2021   10:29:22   (  -0.01,-137.19) (  -0.85,-133.57)  413.52                80
 05/19/2021   22:53:37   (   0.01,-137.17) (  -0.37,-138.76)  181.67                80
 05/20/2021   22:31:59   (   0.01,-137.17) (   0.67,-134.18)  340.59                80
 05/22/2021   10:56:07   (  -0.00,-137.16) (   0.50,-139.35)  250.25                80
 05/23/2021   10:34:29   (  -0.01,-137.15) (  -0.55,-134.77)  271.60                80
 05/24/2021   22:58:46   (   0.00,-137.12) (  -0.61,-139.98)  324.94                80
 05/25/2021   22:37:07   (   0.01,-137.11) (   0.37,-135.38)  196.41                80
 05/27/2021   11:01:14   (  -0.01,-137.08) (   0.79,-140.55)  396.00                80
 05/28/2021   10:39:37   (  -0.01,-137.06) (  -0.26,-135.97)  124.86                80