Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/08/2021   22:25:12   (  -0.41,-128.17) (  -1.12,-131.38)  365.69                80
 09/09/2021   22:08:54   (  -0.42,-128.16) (  -0.11,-126.78)  156.49                80
 09/11/2021   10:27:41   (   0.41,-128.19) (   1.28,-131.96)  430.08                80
 09/12/2021   10:11:24   (   0.41,-128.18) (   0.21,-127.37)   91.74                80
 09/14/2021   22:14:00   (  -0.40,-128.08) (  -0.37,-127.99)   10.70                80
 09/17/2021   10:13:49   (   0.38,-128.08) (   0.52,-128.56)   56.51                80
 09/18/2021   09:57:32   (   0.39,-128.06) (  -0.55,-123.98)  464.81                80
 09/19/2021   22:16:27   (  -0.37,-127.97) (  -0.61,-129.19)  137.83                80
 09/20/2021   22:00:09   (  -0.38,-127.95) (   0.40,-124.59)  383.40                80