Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/26/2021   10:19:43   (  -0.14,-127.76) (   0.46,-130.45)  306.43                80
 07/27/2021   10:03:24   (  -0.13,-127.79) (  -0.53,-125.85)  220.73                80
 07/28/2021   22:22:20   (   0.15,-127.73) (  -0.61,-131.06)  380.13                80
 07/29/2021   22:06:03   (   0.14,-127.77) (   0.44,-126.48)  146.91                80
 07/31/2021   10:24:51   (  -0.16,-127.93) (   0.66,-131.67)  425.94                80
 08/01/2021   10:08:33   (  -0.15,-127.96) (  -0.33,-127.07)  100.79                80
 08/03/2021   22:11:11   (   0.17,-127.92) (   0.19,-127.69)   25.47                80
 08/06/2021   10:11:01   (  -0.18,-128.09) (  -0.12,-128.29)   23.16                80
 08/08/2021   22:13:39   (   0.19,-128.03) (  -0.01,-128.91)  100.07                80