Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/23/2021   22:29:01   (   0.27,-128.22) (  -0.70,-132.52)  490.46                80
 08/24/2021   22:10:03   (   0.27,-128.23) (   0.31,-127.93)   33.69                80
 08/27/2021   10:12:34   (  -0.27,-128.32) (  -0.24,-128.53)   23.29                80
 08/29/2021   22:15:11   (   0.28,-128.25) (   0.09,-129.14)  101.49                80
 08/30/2021   21:58:52   (   0.28,-128.25) (   1.09,-124.54)  421.64                80
 09/01/2021   10:17:40   (  -0.30,-128.32) (   0.03,-129.73)  160.77                80
 09/02/2021   10:01:23   (  -0.29,-128.32) (  -1.03,-125.15)  362.21                80
 09/03/2021   22:22:57   (   0.31,-128.23) (  -0.18,-130.34)  240.48                80
 09/04/2021   22:02:38   (   0.31,-128.23) (   0.88,-125.76)  281.95                 2
 09/06/2021   10:22:47   (  -0.32,-128.29) (   0.30,-130.93)  301.82                80