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) (   0.16,-127.45)   40.06                80
 07/16/2021   10:09:26   (  -0.07,-127.79) (  -0.00,-128.03)   27.93                80
 07/17/2021   09:53:09   (  -0.06,-127.75) (  -1.05,-123.44)  491.15                80
 07/18/2021   22:12:04   (   0.08,-127.60) (  -0.17,-128.64)  119.14                80
 07/19/2021   21:55:47   (   0.08,-127.56) (   0.89,-124.06)  399.51                80
 07/21/2021   10:14:34   (  -0.10,-127.57) (   0.27,-129.23)  189.43                80
 07/22/2021   09:58:15   (  -0.09,-127.52) (  -0.73,-124.63)  328.69                80
 07/23/2021   22:17:12   (   0.11,-127.36) (  -0.42,-129.85)  282.86                80
 07/24/2021   22:00:53   (   0.11,-127.31) (   0.58,-125.25)  235.30                80
 07/26/2021   10:19:41   (  -0.13,-127.32) (   0.59,-130.43)  353.94                80