Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/14/2021   22:02:29   (   0.21,-128.13) (   0.81,-125.52)  297.56                80
 08/16/2021   10:21:17   (  -0.23,-128.24) (   0.31,-130.71)  280.54                80
 08/17/2021   10:04:58   (  -0.23,-128.25) (  -0.69,-126.11)  244.09                80
 08/18/2021   22:23:54   (   0.25,-128.18) (  -0.48,-131.31)  358.33                80
 08/19/2021   22:07:36   (   0.24,-128.18) (   0.58,-126.73)  165.81                80
 08/21/2021   10:26:24   (  -0.26,-128.29) (   0.54,-131.92)  413.57                80
 08/22/2021   10:10:06   (  -0.26,-128.29) (  -0.46,-127.32)  110.86                80
 08/23/2021   22:31:41   (   0.27,-128.22) (  -0.70,-132.53)  490.99                80
 08/24/2021   22:12:44   (   0.26,-128.23) (   0.36,-127.94)   33.32                80
 08/27/2021   10:12:34   (  -0.27,-128.33) (  -0.23,-128.53)   22.47                80