Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 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)
 04/18/2021   09:57:52   (   0.01,-127.92) (  -0.44,-125.84)  236.47                80
 04/19/2021   22:19:29   (  -0.02,-127.85) (  -0.71,-131.05)  364.16                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.31,-126.47)  155.01                80
 04/22/2021   10:24:39   (   0.03,-127.78) (   0.92,-131.63)  439.52                80
 04/23/2021   10:03:01   (   0.02,-127.74) (  -0.11,-127.04)   78.71                80
 04/25/2021   22:05:40   (  -0.02,-127.62) (  -0.01,-127.67)    5.72                80
 04/28/2021   10:10:51   (   0.02,-127.53) (   0.16,-128.26)   82.25                80
 04/29/2021   09:49:13   (   0.01,-127.48) (  -0.87,-123.67)  435.02                80
 04/30/2021   22:10:49   (  -0.02,-127.38) (  -0.33,-128.87)  169.63                80
 05/01/2021   21:54:31   (  -0.01,-127.33) (   0.70,-124.29)  348.07                80