Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 2 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/16/2021   21:58:03   (   0.19,-127.95) (   0.71,-125.64)  262.90                80
 02/18/2021   10:19:31   (  -0.19,-127.96) (   0.48,-130.81)  326.09                80
 02/19/2021   09:57:54   (  -0.19,-127.99) (  -0.59,-126.24)  199.57                80
 02/20/2021   22:19:31   (   0.18,-128.06) (  -0.60,-131.45)  386.68                80
 02/21/2021   22:03:15   (   0.18,-128.09) (   0.47,-126.87)  139.07                80
 02/23/2021   10:24:42   (  -0.17,-128.10) (   0.73,-132.05)  450.36                80
 02/24/2021   10:03:06   (  -0.17,-128.12) (  -0.34,-127.47)   74.50                80
 02/26/2021   22:08:26   (   0.16,-128.20) (   0.18,-128.09)   11.48                80
 03/01/2021   10:10:56   (  -0.16,-128.22) (  -0.04,-128.69)   53.76                80