Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/19/2021   10:12:30   (   0.07,-128.27) (   0.15,-128.52)   29.82                80
 05/20/2021   09:50:52   (   0.07,-128.29) (  -0.89,-123.94)  495.30                80
 05/21/2021   22:12:29   (  -0.07,-128.25) (  -0.28,-129.15)  102.69                80
 05/22/2021   21:56:11   (  -0.07,-128.27) (   0.76,-124.56)  422.59                80
 05/24/2021   10:17:40   (   0.07,-128.37) (   0.37,-129.75)  156.68                80
 05/25/2021   09:56:02   (   0.07,-128.38) (  -0.67,-125.16)  367.60                80
 05/26/2021   22:17:38   (  -0.07,-128.33) (  -0.51,-130.37)  232.66                80
 05/27/2021   22:01:21   (  -0.07,-128.34) (   0.53,-125.78)  291.71                80
 05/29/2021   10:22:48   (   0.07,-128.43) (   0.65,-130.96)  288.07                80
 05/30/2021   10:01:11   (   0.07,-128.44) (  -0.39,-126.37)  235.67                80
 05/31/2021   22:22:47   (  -0.07,-128.37) (  -0.79,-131.58)  365.93                80