Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 11 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/01/2021   22:03:01   (  -0.16,-128.43) (   0.60,-124.98)  392.07                80
 11/03/2021   10:21:47   (   0.13,-128.44) (   0.54,-130.16)  196.13                80
 11/04/2021   10:05:29   (   0.15,-128.44) (  -0.49,-125.56)  328.34                80
 11/05/2021   22:24:25   (  -0.12,-128.44) (  -0.63,-130.78)  265.69                80
 11/06/2021   22:08:06   (  -0.14,-128.44) (   0.40,-126.18)  258.31                80
 11/08/2021   10:26:53   (   0.11,-128.44) (   0.74,-131.36)  331.37                80
 11/09/2021   10:10:33   (   0.12,-128.44) (  -0.23,-126.75)  192.10                80
 11/10/2021   22:29:30   (  -0.09,-128.43) (  -0.88,-131.97)  403.28                80
 11/11/2021   22:13:11   (  -0.10,-128.42) (   0.15,-127.37)  120.19                80
 11/13/2021   10:31:57   (   0.07,-128.42) (   0.99,-132.54)  469.68                80
 11/14/2021   10:15:39   (   0.08,-128.42) (  -0.04,-127.95)   53.79                80