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   22:26:51   (   0.02,-137.19) (   0.98,-132.98)  480.99                80
 05/17/2021   10:50:59   (  -0.01,-137.19) (   0.20,-138.15)  108.86                80
 05/18/2021   10:29:21   (  -0.01,-137.19) (  -0.85,-133.56)  413.74                80
 05/19/2021   22:53:36   (   0.01,-137.18) (  -0.35,-138.77)  181.27                80
 05/20/2021   22:31:59   (   0.01,-137.17) (   0.71,-134.18)  341.14                80
 05/22/2021   10:56:05   (  -0.00,-137.16) (   0.50,-139.35)  249.48                80
 05/23/2021   10:34:28   (  -0.01,-137.15) (  -0.57,-134.76)  272.57                80
 05/24/2021   22:58:43   (   0.00,-137.12) (  -0.61,-139.97)  323.67                80
 05/25/2021   22:37:05   (   0.01,-137.11) (   0.41,-135.38)  197.90                80
 05/27/2021   11:01:11   (  -0.01,-137.09) (   0.77,-140.54)  394.13                80
 05/28/2021   10:39:33   (  -0.01,-137.06) (  -0.26,-135.95)  126.98                80