Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/09/2021   22:08:54   (  -0.42,-128.16) (  -0.12,-126.78)  156.65                80
 09/11/2021   10:27:42   (   0.41,-128.19) (   1.23,-131.97)  429.78                80
 09/12/2021   10:11:23   (   0.41,-128.18) (   0.22,-127.37)   92.08                80
 09/14/2021   22:14:00   (  -0.40,-128.08) (  -0.37,-127.98)   11.04                80
 09/17/2021   10:13:50   (   0.38,-128.08) (   0.47,-128.58)   55.92                80
 09/18/2021   09:57:32   (   0.39,-128.06) (  -0.54,-123.98)  465.45                80
 09/19/2021   22:16:27   (  -0.37,-127.98) (  -0.62,-129.19)  137.17                80
 09/20/2021   22:00:09   (  -0.38,-127.96) (   0.39,-124.59)  384.08                80
 09/22/2021   10:18:56   (   0.36,-127.98) (   0.77,-129.77)  204.27                80