Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/29/2021   09:49:13   (   0.03,-127.50) (  -0.85,-123.66)  438.24                80
 04/30/2021   22:10:48   (  -0.04,-127.42) (  -0.35,-128.86)  164.36                80
 05/01/2021   21:54:30   (  -0.03,-127.38) (   0.68,-124.28)  353.82                80
 05/03/2021   10:15:58   (   0.04,-127.33) (   0.55,-129.44)  241.91                80
 05/04/2021   09:54:20   (   0.04,-127.28) (  -0.49,-124.86)  275.46                80
 05/05/2021   22:15:55   (  -0.05,-127.18) (  -0.72,-130.06)  328.71                80
 05/06/2021   21:59:38   (  -0.04,-127.14) (   0.31,-125.47)  189.45                80
 05/08/2021   10:21:06   (   0.05,-127.10) (   0.85,-130.65)  405.03                80
 05/09/2021   09:59:29   (   0.04,-127.04) (  -0.18,-126.06)  112.12                80
 05/10/2021   22:21:04   (  -0.05,-126.93) (  -1.02,-131.26)  493.95                80
 05/11/2021   22:04:47   (  -0.04,-126.88) (   0.01,-126.68)   23.62                80