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."