Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/11/2021   10:16:09   (  -0.21,-128.16) (   0.07,-129.50)  152.21                80
 08/12/2021   09:59:51   (  -0.20,-128.18) (  -0.92,-124.90)  373.23                80
 08/13/2021   22:18:46   (   0.22,-128.11) (  -0.25,-130.11)  228.19                80
 08/14/2021   22:02:29   (   0.21,-128.12) (   0.81,-125.52)  296.62                80
 08/16/2021   10:21:17   (  -0.23,-128.23) (   0.31,-130.71)  282.06                80
 08/17/2021   10:04:58   (  -0.23,-128.24) (  -0.68,-126.11)  242.37                80
 08/18/2021   22:23:54   (   0.25,-128.16) (  -0.48,-131.32)  360.11                80
 08/19/2021   22:07:36   (   0.24,-128.17) (   0.58,-126.73)  163.80                80
 08/21/2021   10:26:25   (  -0.26,-128.26) (   0.55,-131.92)  416.22                80
 08/22/2021   10:10:06   (  -0.26,-128.27) (  -0.45,-127.32)  108.00                80
 08/23/2021   22:31:41   (   0.27,-128.20) (  -0.71,-132.53)  493.89                80