Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/21/2021   10:26:24   (  -0.26,-128.29) (   0.55,-131.91)  413.27                80
 08/22/2021   10:10:06   (  -0.26,-128.30) (  -0.45,-127.32)  111.10                80
 08/23/2021   22:29:01   (   0.27,-128.22) (  -0.71,-132.52)  490.63                80
 08/24/2021   22:12:44   (   0.27,-128.23) (   0.35,-127.94)   33.55                80
 08/27/2021   10:12:34   (  -0.27,-128.33) (  -0.23,-128.53)   22.42                80
 08/29/2021   22:15:10   (   0.28,-128.26) (   0.07,-129.14)  100.85                80
 08/30/2021   21:58:53   (   0.28,-128.26) (   1.13,-124.55)  422.42                80
 09/01/2021   10:17:41   (  -0.30,-128.34) (  -0.00,-129.74)  159.34                80
 09/02/2021   10:01:23   (  -0.29,-128.33) (  -1.01,-125.14)  363.79                80
 09/03/2021   22:22:58   (   0.31,-128.25) (  -0.15,-130.35)  239.16                80