Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/03/2021   22:22:59   (   0.03,-128.28) (  -0.80,-132.02)  426.19                80
 04/04/2021   22:06:42   (   0.03,-128.27) (   0.22,-127.43)   94.91                80
 04/06/2021   10:28:10   (  -0.02,-128.23) (   0.95,-132.61)  499.06                80
 04/07/2021   10:06:32   (  -0.03,-128.21) (  -0.07,-128.03)   21.19                80
 04/09/2021   22:09:11   (   0.02,-128.17) (  -0.06,-128.65)   54.22                80
 04/10/2021   21:52:54   (   0.03,-128.15) (   0.96,-124.06)  466.79                80
 04/12/2021   10:14:22   (  -0.02,-128.12) (   0.22,-129.24)  127.15                80
 04/13/2021   09:52:45   (  -0.03,-128.09) (  -0.81,-124.65)  392.72                80
 04/14/2021   22:14:20   (   0.01,-128.06) (  -0.40,-129.85)  204.95                80
 04/15/2021   21:58:02   (   0.02,-128.04) (   0.62,-125.26)  315.36                80