Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/18/2021   22:23:54   (   0.25,-128.18) (  -0.48,-131.31)  358.12                80
 08/19/2021   22:07:36   (   0.25,-128.19) (   0.58,-126.73)  166.07                80
 08/21/2021   10:26:24   (  -0.26,-128.29) (   0.54,-131.92)  413.09                80
 08/22/2021   10:10:06   (  -0.26,-128.30) (  -0.46,-127.32)  111.36                80
 08/23/2021   22:29:01   (   0.27,-128.22) (  -0.69,-132.53)  490.56                80
 08/24/2021   22:10:03   (   0.27,-128.23) (   0.31,-127.93)   33.77                80
 08/27/2021   10:12:34   (  -0.27,-128.34) (  -0.25,-128.53)   21.77                80
 08/29/2021   22:17:50   (   0.28,-128.26) (   0.10,-129.14)  100.16                80
 08/30/2021   21:58:52   (   0.28,-128.26) (   1.11,-124.55)  423.21                80