Function for topocentric planet positions
swe_set_topo(longitude, lat, height)
Geographic longitude as double (deg)
Geographic latitude as double (deg)
Height as double (m)
Set the topocentric location of the observer.
Section 9 in http://www.astro.com/swisseph/swephprg.htm
# NOT RUN { swe_set_topo(0,50,10) # }
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