Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 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)
 01/23/2021   10:12:23   (   0.33,-127.82) (   0.64,-129.15)  151.99                80
 01/24/2021   09:50:46   (   0.31,-127.79) (  -0.42,-124.58)  366.90                80
 01/25/2021   22:15:02   (  -0.35,-127.79) (  -0.81,-129.78)  226.97                80
 01/26/2021   21:53:26   (  -0.33,-127.76) (   0.25,-125.20)  291.53                80
 01/28/2021   10:17:33   (   0.37,-127.65) (   0.97,-130.37)  309.46                80
 01/29/2021   09:55:56   (   0.35,-127.62) (  -0.03,-125.78)  208.70                80
 01/30/2021   22:20:13   (  -0.39,-127.60) (  -1.15,-131.00)  386.37                80
 01/31/2021   21:58:37   (  -0.37,-127.57) (  -0.08,-126.42)  131.65                80
 02/02/2021   10:22:44   (   0.40,-127.46) (   1.30,-131.59)  470.07                80
 02/03/2021   10:01:06   (   0.39,-127.41) (   0.30,-127.00)   47.58                80