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)
 02/09/2021   09:47:20   (   0.41,-127.52) (  -0.44,-123.63)  442.70                80
 02/10/2021   22:11:37   (  -0.44,-127.61) (  -0.75,-128.84)  140.90                80
 02/11/2021   21:50:01   (  -0.43,-127.65) (   0.32,-124.27)  385.99                80
 02/13/2021   10:14:08   (   0.45,-127.68) (   0.88,-129.44)  200.54                80
 02/14/2021   09:52:32   (   0.44,-127.72) (  -0.19,-124.86)  326.25                80
 02/15/2021   22:16:49   (  -0.46,-127.82) (  -0.99,-130.08)  257.74                80
 02/16/2021   21:55:12   (  -0.45,-127.86) (   0.08,-125.50)  268.99                80
 02/18/2021   10:19:20   (   0.47,-127.88) (   1.12,-130.67)  318.10                80
 02/19/2021   09:57:43   (   0.47,-127.92) (   0.05,-126.09)  208.21                80
 02/20/2021   22:22:01   (  -0.49,-128.00) (  -1.22,-131.31)  377.01                80
 02/21/2021   22:00:23   (  -0.48,-128.03) (  -0.21,-126.72)  149.09                80