Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/13/2021   22:09:37   (   0.07,-127.80) (   0.13,-127.44)   40.17                80
 07/16/2021   10:09:27   (  -0.07,-127.79) (  -0.03,-128.03)   27.70                80
 07/17/2021   09:53:08   (  -0.06,-127.75) (  -1.02,-123.44)  491.43                80
 07/18/2021   22:12:05   (   0.08,-127.60) (  -0.14,-128.65)  118.82                80
 07/19/2021   21:55:46   (   0.08,-127.56) (   0.86,-124.05)  399.87                80
 07/21/2021   10:14:33   (  -0.10,-127.57) (   0.30,-129.22)  188.95                80
 07/22/2021   09:58:16   (  -0.09,-127.53) (  -0.75,-124.64)  329.24                80
 07/23/2021   22:17:11   (   0.12,-127.37) (  -0.45,-129.84)  282.28                80
 07/24/2021   22:00:54   (   0.11,-127.32) (   0.60,-125.26)  235.95                80
 07/26/2021   10:19:41   (  -0.13,-127.33) (   0.56,-130.43)  353.16                80
 07/27/2021   10:03:23   (  -0.12,-127.28) (  -0.43,-125.83)  165.08                80