Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/13/2021   10:26:19   (   0.06,-128.12) (   0.89,-131.91)  431.11                80
 05/14/2021   10:04:41   (   0.06,-128.14) (  -0.15,-127.32)   94.44                80
 05/16/2021   22:09:59   (  -0.06,-128.14) (  -0.02,-127.93)   23.41                80
 05/19/2021   10:12:29   (   0.07,-128.26) (   0.15,-128.52)   30.08                80
 05/20/2021   09:50:52   (   0.07,-128.28) (  -0.90,-123.94)  495.03                80
 05/21/2021   22:12:27   (  -0.07,-128.24) (  -0.30,-129.14)  103.04                80
 05/22/2021   21:56:09   (  -0.07,-128.26) (   0.76,-124.55)  422.25                80
 05/24/2021   10:17:37   (   0.07,-128.36) (   0.40,-129.73)  156.92                80
 05/25/2021   09:55:59   (   0.06,-128.37) (  -0.66,-125.15)  367.38                80
 05/26/2021   22:17:34   (  -0.06,-128.31) (  -0.52,-130.35)  232.76                80