The current Swiss Ephemeris (astro.com or www.astro.com/swisseph/swephinfo_e.htm) "...is based on the DE431 ephemeris released by JPL in September 2013..." showed the Moon's North Node ecliptic longitude last Wednesday (when Moon crossed the ecliptic) at around 161 degrees, but according to Stellarium 0.15.0 it was around 165 degrees!! Moreover, the position of Moon at noon in Southern California on Oct. 30, 2016 was different by about 16 minutes of arc (or roughly half an hour of clock time). Which source is more accurate? Could you please enlighten me? Thank you so much in advance for your help. Have a great week.