Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 20.  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)  413.15                80
 08/22/2021   10:10:06   (  -0.26,-128.30) (  -0.45,-127.32)  111.27                80
 08/23/2021   22:29:01   (   0.27,-128.22) (  -0.71,-132.52)  490.59                80
 08/24/2021   22:12:44   (   0.27,-128.23) (   0.35,-127.94)   33.67                80
 08/27/2021   10:12:34   (  -0.27,-128.33) (  -0.23,-128.53)   21.99                80
 08/29/2021   22:15:10   (   0.28,-128.26) (   0.08,-129.14)  100.47                80
 08/30/2021   21:58:53   (   0.28,-128.26) (   1.14,-124.56)  422.86                80
 09/01/2021   10:17:40   (  -0.30,-128.34) (   0.04,-129.73)  158.64                80
 09/02/2021   10:01:23   (  -0.29,-128.34) (  -1.02,-125.14)  364.56                80