St. Pierre & Miquelon

 

 
 
Date FP Sunrise Time (UTC)
October 23 1020
October 24 1021
October 25 1023
October 26 1024
October 27 1026
October 28 1027
October 29 1029
October 30 1030
October 31 1032
November 1 1033
November 2 1034

Data source: W6ELProp

Date FP Sunset Time (UTC)
October 23 2039
October 24 2038
October 25 2036
October 26 2034
October 27 2033
October 28 2031
October 29 2030
October 30 2028
October 31 2026
November 1 2025
November 2 2024

Data source: W6ELProp



 

Date FP Sunrise Time (Local)
October 23 0720
October 24 0721
October 25 0723
October 26 0724
October 27 0726
October 28 0727
October 29 0729
October 30 0730
October 31 0732
November 1 0733
November 2 0734

Data source: W6ELProp

Date FP Sunset Time (Local)
October 23 1739
October 24 1738
October 25 1736
October 26 1734
October 27 1733
October 28 1731
October 29 1730
October 30 1728
October 31 1726
November 1 1725
November 2 1724

Data source: W6ELProp

 
How Sunrise / Sunset time is defined

Sunrise / Sunset time is typically defined as one of following three conditions:
  • Civil sunrise/sunset corresponds to the center of the Sun being 6 degrees below the horizon
  • Nautical sunrise/sunset corresponds to the center of the Sun being 12 degrees below the horizon
  • Astronomical sunrise/sunset corresponds to the center of the Sun being 18 degrees below the horizon.
     
  • The foregoing three conditions were likely established for the 'ability to see' or monitor certain atmospheric conditions, not Ionospheric issues. The W6ELProp program doesn't use any of the three conditions since it simply defines sunrise/sunset as when the center of the Sun is on the horizon not 6, 12, or 18 degrees below the horizon.

    The problem with defining sunrise and sunset for Ionospheric purposes is that it means different things for the different regions of the Ionosphere. For the higher HF bands, illumination of the F region is what's important (for MUF issues). For the lower HF bands, illumination of the D region is what's important (for absorption issues). Since the D region and the F region are at different heights, the times when the Sun illuminates them will be different. Couple this with the fact that the ionosphere is quite dynamic and thus the processes vary on a day-to-day basis. So trying to pin this down to the exact minute is, going to the extreme.

    The bottom line on sunrise and sunset time is simple -- it's a window of low-band opportunity, and one needs to know the general area of this window to be amongst the Deserving.

    Drawing on empirical wisdom to substantiate the importance of sunrise and sunset in the grand scheme of DX'ing.....  Red Eyed Louie was once heard to say, "One must give full consideration to the overall factors and the interplay of the various forces. But if you are in the know, you will recognize it."


Last modified July 16, 2004 by Paul B. Peters, Show contact information
Copyright 2000 -2004 Paul B. Peters, VE7AVV. All rights reserved.