Simultaneous Nadir Overpasses (SNOs) between FY3D and METOP-A
TLE Epoch: 2021 11 19.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(METOP-A) METOP-A Lat/Lon    Distance(km)  Time Diff(sec)
 11/25/2021   21:34:04   (  77.79,-163.09) 11/25/2021   21:35:09  (  77.80,-162.96)    3.50                65
 11/25/2021   22:24:49   ( -77.78,   4.27) 11/25/2021   22:25:36  ( -77.76,   4.23)    2.58                47
 11/25/2021   23:15:36   (  77.77, 171.61) 11/25/2021   23:15:59  (  77.76, 171.63)    1.84                23
 11/26/2021   00:06:21   ( -77.76, -21.03) 11/26/2021   00:06:25  ( -77.75, -21.00)    1.35                 4
 11/26/2021   00:57:08   (  77.76, 146.30) 11/26/2021   00:56:48  (  77.75, 146.41)    2.52                20
 11/26/2021   01:47:53   ( -77.75, -46.33) 11/26/2021   01:47:14  ( -77.75, -46.23)    2.56                39
 11/26/2021   02:38:40   (  77.74, 121.00) 11/26/2021   02:37:38  (  77.71, 121.00)    3.35                62
 11/26/2021   03:29:18   ( -77.44, -70.25) 11/26/2021   03:28:10  ( -77.44, -72.80)   61.62                68