Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 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)
 05/20/2021   09:50:52   (   0.07,-128.29) (  -0.88,-123.94)  495.52                80
 05/21/2021   22:12:28   (  -0.07,-128.25) (  -0.28,-129.15)  102.20                80
 05/22/2021   21:56:11   (  -0.07,-128.27) (   0.76,-124.56)  423.22                80
 05/24/2021   10:17:39   (   0.07,-128.37) (   0.37,-129.75)  155.96                80
 05/25/2021   09:56:02   (   0.07,-128.39) (  -0.67,-125.16)  368.44                80
 05/26/2021   22:17:38   (  -0.07,-128.33) (  -0.49,-130.37)  231.56                80
 05/27/2021   22:01:20   (  -0.07,-128.35) (   0.49,-125.77)  292.96                80
 05/29/2021   10:22:48   (   0.07,-128.44) (   0.63,-130.96)  286.69                80
 05/30/2021   10:01:11   (   0.07,-128.45) (  -0.41,-126.37)  237.18                80
 05/31/2021   22:22:46   (  -0.07,-128.38) (  -0.81,-131.57)  364.20                80
 06/01/2021   22:06:28   (  -0.07,-128.39) (   0.23,-126.98)  160.17                80