Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 9 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)
 09/19/2020   10:00:53   (  -0.11,-128.30) (  -0.39,-127.03)  145.44                80
 09/20/2020   22:22:32   (   0.11,-128.29) (  -0.78,-132.25)  451.43                80
 09/21/2020   22:00:55   (   0.11,-128.31) (   0.24,-127.67)   72.38                80
 09/24/2020   10:06:09   (  -0.12,-128.38) (  -0.15,-128.29)   11.09                80
 09/26/2020   22:08:51   (   0.13,-128.38) (  -0.00,-128.93)   63.35                80
 09/27/2020   21:47:14   (   0.13,-128.39) (   1.02,-124.35)  459.87                80
 09/29/2020   10:08:44   (  -0.13,-128.44) (   0.14,-129.54)  125.66                80
 09/30/2020   09:52:28   (  -0.13,-128.46) (  -0.94,-124.97)  397.85                80
 10/01/2020   22:14:06   (   0.13,-128.44) (  -0.24,-130.20)  199.81                80