Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/19/2021   22:07:36   (   0.25,-128.19) (   0.58,-126.73)  166.22                80
 08/21/2021   10:26:24   (  -0.26,-128.29) (   0.54,-131.91)  413.03                80
 08/22/2021   10:10:06   (  -0.26,-128.30) (  -0.46,-127.32)  111.41                80
 08/23/2021   22:29:01   (   0.27,-128.22) (  -0.70,-132.52)  490.47                80
 08/24/2021   22:12:44   (   0.27,-128.23) (   0.36,-127.94)   33.86                80
 08/27/2021   10:12:34   (  -0.27,-128.34) (  -0.24,-128.53)   21.71                80
 08/29/2021   22:17:50   (   0.28,-128.26) (   0.09,-129.14)  100.15                80
 08/30/2021   21:58:52   (   0.28,-128.26) (   1.09,-124.54)  423.20                80
 09/01/2021   10:17:40   (  -0.30,-128.35) (   0.03,-129.73)  158.16                80