Useful functions
swe_day_of_week(jd)
Julian day number as numeric vector (day)
swe_day_of_week returns the day of week as integer vector (0 Monday .. 6 Sunday)
swe_day_of_week
Determine day of week from Julian day number.
Section 16.7 in http://www.astro.com/swisseph/swephprg.htm
# NOT RUN { swe_day_of_week(1234.567) # }
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