Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/17/2021   10:19:30   (   0.01,-127.96) (   0.59,-130.43)  282.47                80
 04/18/2021   09:57:52   (   0.00,-127.92) (  -0.43,-125.84)  236.20                80
 04/19/2021   22:19:29   (  -0.02,-127.85) (  -0.72,-131.05)  364.51                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.31,-126.47)  154.60                80
 04/22/2021   10:24:40   (   0.02,-127.78) (   0.87,-131.64)  440.00                80
 04/23/2021   10:03:02   (   0.02,-127.74) (  -0.15,-127.05)   78.13                80
 04/25/2021   22:05:40   (  -0.02,-127.62) (  -0.03,-127.67)    5.94                80
 04/28/2021   10:10:51   (   0.02,-127.53) (   0.18,-128.26)   83.00                80
 04/29/2021   09:49:13   (   0.01,-127.48) (  -0.85,-123.67)  434.16                80