Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 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)
 07/23/2021   22:17:12   (   0.13,-127.56) (  -0.37,-129.86)  261.55                80
 07/24/2021   22:00:54   (   0.12,-127.59) (   0.63,-125.26)  265.72                80
 07/26/2021   10:19:42   (  -0.14,-127.76) (   0.47,-130.45)  305.98                80
 07/27/2021   10:03:25   (  -0.13,-127.80) (  -0.58,-125.86)  221.34                80
 07/28/2021   22:22:20   (   0.15,-127.74) (  -0.62,-131.06)  379.67                80
 07/29/2021   22:06:03   (   0.14,-127.77) (   0.44,-126.48)  147.53                80
 07/31/2021   10:24:51   (  -0.16,-127.94) (   0.66,-131.67)  424.65                80
 08/01/2021   10:08:32   (  -0.15,-127.97) (  -0.33,-127.07)  102.24                80
 08/02/2021   22:27:29   (   0.17,-127.90) (  -0.79,-132.29)  499.56                80
 08/03/2021   22:11:10   (   0.16,-127.93) (   0.21,-127.69)   26.82                80