Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/18/2021   10:07:12   (   0.29,-127.95) (   0.30,-127.94)    1.92                80
 01/20/2021   22:09:52   (  -0.31,-127.94) (  -0.47,-128.57)   71.53                80
 01/21/2021   21:48:15   (  -0.29,-127.92) (   0.59,-123.99)  447.80                80
 01/23/2021   10:12:23   (   0.33,-127.82) (   0.65,-129.15)  151.99                80
 01/24/2021   09:50:46   (   0.31,-127.80) (  -0.41,-124.58)  366.99                80
 01/25/2021   22:15:03   (  -0.35,-127.80) (  -0.82,-129.78)  226.63                80
 01/26/2021   21:53:26   (  -0.34,-127.76) (   0.24,-125.20)  291.93                80
 01/28/2021   10:17:33   (   0.37,-127.66) (   0.99,-130.37)  309.15                80
 01/29/2021   09:55:57   (   0.36,-127.62) (  -0.07,-125.79)  209.07                80
 01/30/2021   22:20:13   (  -0.39,-127.62) (  -1.16,-131.00)  385.68                80
 01/31/2021   21:58:37   (  -0.37,-127.58) (  -0.11,-126.42)  132.34                80