Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2021   22:25:56   (   0.08,-127.83) (  -0.85,-132.04)  479.61                80
 07/13/2021   22:09:37   (   0.06,-127.80) (   0.14,-127.45)   39.94                80
 07/16/2021   10:09:26   (  -0.07,-127.78) (   0.01,-128.03)   28.26                80
 07/17/2021   09:53:09   (  -0.06,-127.74) (  -1.04,-123.44)  490.84                80
 07/18/2021   22:12:04   (   0.08,-127.60) (  -0.18,-128.64)  119.51                80
 07/19/2021   21:55:46   (   0.08,-127.55) (   0.88,-124.06)  399.10                80
 07/21/2021   10:14:34   (  -0.10,-127.56) (   0.28,-129.23)  189.95                80
 07/22/2021   09:58:15   (  -0.09,-127.52) (  -0.72,-124.63)  328.13                80
 07/23/2021   22:17:12   (   0.11,-127.36) (  -0.43,-129.85)  283.44                80
 07/24/2021   22:00:53   (   0.10,-127.31) (   0.57,-125.25)  234.67                80