Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/22/2021   10:24:39   (   0.03,-127.78) (   0.91,-131.63)  438.76                80
 04/23/2021   10:03:01   (   0.03,-127.74) (  -0.12,-127.04)   79.58                80
 04/25/2021   22:08:19   (  -0.03,-127.63) (  -0.06,-127.66)    4.75                80
 04/28/2021   10:10:50   (   0.03,-127.55) (   0.20,-128.25)   80.32                80
 04/29/2021   09:49:12   (   0.02,-127.50) (  -0.83,-123.66)  437.09                80
 04/30/2021   22:10:48   (  -0.03,-127.40) (  -0.38,-128.86)  167.05                80
 05/01/2021   21:54:30   (  -0.02,-127.36) (   0.65,-124.27)  350.85                80
 05/03/2021   10:15:58   (   0.03,-127.31) (   0.52,-129.45)  244.16                80
 05/04/2021   09:54:21   (   0.03,-127.26) (  -0.51,-124.87)  272.95                80
 05/05/2021   22:15:56   (  -0.04,-127.15) (  -0.69,-130.07)  332.60                80