Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 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)
 06/20/2021   10:02:46   (   0.03,-128.46) (  -0.37,-126.61)  210.41                80
 06/21/2021   22:24:22   (  -0.01,-128.35) (  -0.82,-131.81)  395.27                80
 06/22/2021   22:08:05   (  -0.02,-128.34) (   0.22,-127.23)  126.60                80
 06/24/2021   10:26:52   (   0.00,-128.40) (   0.92,-132.41)  456.55                80
 06/25/2021   10:10:34   (   0.01,-128.38) (  -0.13,-127.82)   64.70                80
 06/27/2021   22:10:32   (  -0.01,-128.25) (  -0.07,-128.43)   21.04                80
 06/30/2021   10:13:02   (   0.01,-128.30) (   0.16,-129.02)   82.56                80
 07/01/2021   09:56:44   (   0.01,-128.28) (  -0.83,-124.42)  438.71                80
 07/02/2021   22:15:40   (   0.00,-128.16) (  -0.35,-129.63)  168.82                80
 07/03/2021   21:59:22   (  -0.01,-128.14) (   0.70,-125.05)  352.43                80