Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/15/2021   22:02:01   (  -0.27,-128.06) (  -0.12,-127.35)   80.33                80
 01/18/2021   10:07:12   (   0.29,-127.96) (   0.30,-127.94)    1.80                80
 01/20/2021   22:09:52   (  -0.31,-127.95) (  -0.46,-128.57)   70.83                80
 01/21/2021   21:48:15   (  -0.29,-127.93) (   0.60,-123.99)  448.61                80
 01/23/2021   10:12:23   (   0.33,-127.83) (   0.63,-129.16)  151.05                80
 01/24/2021   09:50:46   (   0.31,-127.81) (  -0.43,-124.58)  368.09                80
 01/25/2021   22:15:03   (  -0.35,-127.81) (  -0.79,-129.79)  225.15                80
 01/26/2021   21:53:26   (  -0.33,-127.78) (   0.27,-125.21)  293.56                80
 01/28/2021   10:17:33   (   0.37,-127.67) (   0.96,-130.38)  307.45                80