Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 23.  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) (  -0.40,-129.85)  261.48                80
 07/24/2021   22:00:54   (   0.12,-127.59) (   0.65,-125.26)  265.75                80
 07/26/2021   10:19:43   (  -0.14,-127.76) (   0.44,-130.45)  306.12                80
 07/27/2021   10:03:24   (  -0.13,-127.80) (  -0.55,-125.85)  221.16                80
 07/28/2021   22:22:21   (   0.15,-127.74) (  -0.59,-131.07)  379.79                80
 07/29/2021   22:06:02   (   0.14,-127.77) (   0.41,-126.47)  147.38                80
 07/31/2021   10:24:50   (  -0.16,-127.94) (   0.70,-131.66)  424.97                80
 08/01/2021   10:08:33   (  -0.15,-127.97) (  -0.36,-127.08)  101.88                80
 08/02/2021   22:27:28   (   0.17,-127.90) (  -0.83,-132.28)  499.87                80
 08/03/2021   22:11:11   (   0.16,-127.92) (   0.23,-127.70)   26.51                80
 08/06/2021   10:11:01   (  -0.18,-128.10) (  -0.12,-128.28)   21.39                80