Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 7 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/23/2020   09:57:12   (   0.01,-128.42) (  -0.32,-126.95)  167.53                80
 07/24/2020   22:18:50   (  -0.01,-128.37) (  -0.85,-132.17)  433.15                80
 07/25/2020   22:02:33   (  -0.01,-128.37) (   0.16,-127.59)   89.38                80
 07/27/2020   10:24:04   (   0.01,-128.43) (   0.99,-132.78)  496.03                80
 07/28/2020   10:02:27   (   0.01,-128.43) (  -0.02,-128.20)   26.16                80
 07/30/2020   22:05:09   (  -0.02,-128.37) (  -0.13,-128.85)   53.81                80
 07/31/2020   21:48:53   (  -0.02,-128.37) (   0.88,-124.26)  467.96                80
 08/02/2020   10:10:23   (   0.03,-128.42) (   0.29,-129.46)  118.62                80
 08/03/2020   09:48:47   (   0.03,-128.42) (  -0.78,-124.89)  402.88                80
 08/04/2020   22:10:25   (  -0.03,-128.35) (  -0.43,-130.10)  199.57                80
 08/05/2020   21:54:08   (  -0.03,-128.35) (   0.59,-125.52)  321.94                80