Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2021   10:34:04   (   0.03,-137.21) (  -0.62,-134.25)  337.01                80
 07/21/2021   22:55:41   (  -0.03,-137.20) (  -0.53,-139.46)  257.88                80
 07/22/2021   22:39:23   (  -0.02,-137.19) (   0.52,-134.88)  264.52                80
 07/24/2021   11:00:49   (   0.02,-137.19) (   0.69,-140.04)  326.24                80
 07/25/2021   10:39:12   (   0.02,-137.18) (  -0.36,-135.46)  196.13                80
 07/26/2021   23:00:47   (  -0.03,-137.16) (  -0.84,-140.66)  399.00                80
 07/27/2021   22:44:30   (  -0.03,-137.16) (   0.21,-136.07)  123.37                80
 07/29/2021   11:05:57   (   0.03,-137.15) (   0.95,-141.25)  467.57                80
 07/30/2021   10:44:20   (   0.03,-137.14) (  -0.10,-136.66)   54.49                80
 08/01/2021   22:46:57   (  -0.02,-137.10) (  -0.03,-137.28)   20.22                80