Simultaneous Nadir Overpasses (SNOs) between NOAA-20 and NOAA-19
TLE Epoch: 2017 12 21.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-20) NOAA-20 Lat/Lon Date Time(NOAA-19) NOAA-19 Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2017   22:25:09   ( -80.71, -23.70) 12/21/2017   22:24:00  ( -80.70, -23.72)    1.06                69
 12/21/2017   23:15:51   (  80.70, 143.89) 12/21/2017   23:15:01  (  80.71, 143.77)    2.85                50
 12/22/2017   00:06:35   ( -80.72, -49.12) 12/22/2017   00:06:01  ( -80.71, -49.09)    1.10                34
 12/22/2017   00:57:17   (  80.70, 118.47) 12/22/2017   00:57:02  (  80.72, 118.40)    2.36                15
 12/22/2017   01:48:01   ( -80.72, -74.54) 12/22/2017   01:48:02  ( -80.71, -74.46)    1.66                 1
 12/22/2017   02:38:44   (  80.73,  92.71) 12/22/2017   02:39:04  (  80.71,  92.66)    2.01                20
 12/22/2017   03:29:27   ( -80.72, -99.96) 12/22/2017   03:30:03  ( -80.72, -99.83)    2.40                36
 12/22/2017   04:20:10   (  80.73,  67.29) 12/22/2017   04:21:05  (  80.71,  67.28)    1.73                55
 12/22/2017   05:10:53   ( -80.73,-125.38) 12/22/2017   05:12:04  ( -80.72,-125.21)    3.20                71
 01/03/2018   01:11:05   ( -80.73, -65.44) 01/03/2018   01:09:50  ( -80.66, -65.86)   10.34                75
 01/03/2018   02:01:46   (  80.70, 102.39) 01/03/2018   02:00:46  (  80.69, 102.21)    3.21                60
 01/03/2018   02:52:30   ( -80.71, -90.51) 01/03/2018   02:51:49  ( -80.70, -90.52)    1.70                41
 01/03/2018   03:43:12   (  80.70,  76.97) 01/03/2018   03:42:47  (  80.70,  76.83)    2.55                25
 01/03/2018   04:33:56   ( -80.71,-115.93) 01/03/2018   04:33:50  ( -80.70,-115.90)    1.66                 6
 01/03/2018   05:24:38   (  80.70,  51.55) 01/03/2018   05:24:48  (  80.70,  51.45)    1.89                10
 01/03/2018   06:15:22   ( -80.72,-141.35) 01/03/2018   06:15:51  ( -80.70,-141.28)    1.95                29
 01/03/2018   07:06:04   (  80.71,  26.14) 01/03/2018   07:06:49  (  80.71,  26.07)    1.22                45