Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 2 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)
 02/08/2021   10:08:57   (   0.43,-127.47) (   0.60,-128.21)   84.09                80
 02/09/2021   09:47:20   (   0.41,-127.52) (  -0.47,-123.63)  442.75                80
 02/10/2021   22:11:38   (  -0.44,-127.61) (  -0.72,-128.85)  140.86                80
 02/11/2021   21:50:01   (  -0.43,-127.65) (   0.35,-124.27)  386.02                80
 02/13/2021   10:14:09   (   0.45,-127.68) (   0.85,-129.44)  200.41                80
 02/14/2021   09:52:32   (   0.44,-127.73) (  -0.22,-124.87)  326.37                80
 02/15/2021   22:16:49   (  -0.46,-127.82) (  -0.97,-130.08)  257.65                80
 02/16/2021   21:55:13   (  -0.45,-127.86) (   0.10,-125.50)  269.09                80
 02/18/2021   10:19:20   (   0.47,-127.89) (   1.10,-130.68)  317.93                80
 02/19/2021   09:57:44   (   0.47,-127.92) (   0.03,-126.10)  208.40                80
 02/20/2021   22:22:01   (  -0.49,-128.00) (  -1.21,-131.31)  376.90                80
 02/21/2021   22:00:24   (  -0.48,-128.04) (  -0.20,-126.72)  149.19                80