Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 7 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2020   21:57:17   (  -0.00,-128.37) (   0.43,-126.33)  231.96                80
 07/22/2020   10:18:48   (   0.01,-128.43) (   0.71,-131.53)  353.55                80
 07/23/2020   09:57:11   (   0.01,-128.43) (  -0.30,-126.94)  168.88                80
 07/24/2020   22:18:49   (  -0.01,-128.38) (  -0.87,-132.17)  431.72                80
 07/25/2020   22:02:33   (  -0.01,-128.39) (   0.15,-127.59)   90.62                80
 07/27/2020   10:24:03   (   0.02,-128.44) (   1.01,-132.78)  495.51                80
 07/28/2020   10:02:28   (   0.02,-128.44) (  -0.06,-128.21)   26.58                80
 07/30/2020   22:05:09   (  -0.03,-128.37) (  -0.13,-128.84)   53.56                80
 07/31/2020   21:48:52   (  -0.03,-128.37) (   0.88,-124.26)  468.00                80
 08/02/2020   10:10:22   (   0.03,-128.41) (   0.28,-129.46)  119.20                80