Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/02/2021   10:10:37   (   0.19,-128.21) (   0.33,-128.88)   75.24                80
 01/03/2021   09:49:00   (   0.16,-128.21) (  -0.73,-124.30)  445.85                80
 01/04/2021   22:13:16   (  -0.21,-128.23) (  -0.48,-129.51)  145.44                80
 01/05/2021   21:51:40   (  -0.18,-128.22) (   0.58,-124.93)  375.34                80
 01/07/2021   10:15:48   (   0.22,-128.16) (   0.63,-130.10)  220.62                80
 01/08/2021   09:54:11   (   0.20,-128.15) (  -0.37,-125.51)  299.96                80
 01/09/2021   22:18:27   (  -0.25,-128.16) (  -0.85,-130.72)  292.31                80
 01/10/2021   21:56:51   (  -0.23,-128.14) (   0.21,-126.14)  227.77                80
 01/12/2021   10:20:59   (   0.27,-128.07) (   0.99,-131.32)  369.41                80
 01/13/2021   09:59:22   (   0.25,-128.05) (  -0.06,-126.74)  150.49                80
 01/14/2021   22:23:39   (  -0.29,-128.06) (  -1.15,-131.94)  442.48                80
 01/15/2021   22:02:02   (  -0.27,-128.04) (  -0.09,-127.37)   77.36                80