Michelsen, Neil

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Michelsen, Neil Gender: M
born on 11 May 1931 at 05:34 (= 05:34 AM )
Place Chicago, Illinois, 41n51, 87w39
Timezone CST h6w (is standard time)
Data source
Rectified from approx. time
Rodden Rating C
Collector: Rodden
Astrology data s_su.18.gif s_taucol.18.gif 19°49' s_mo.18.gif s_piscol.18.gif 11°07 Asc.s_gemcol.18.gif 06°34'


American entrepreneur who developed programs for astrological computations in his spare time while working for IBM for 17 years. In 1973 he founded ACS, Astro-Computing Service., a creation which melded together his two lifelong interests, metaphysics and computers. As ACS became the leading source of computerized calculations for astrologers, a publishing division was added and the name was legally changed to Astro-Communications-Services in 1990.

Michelsen was the recipient of the Marc Edmund Jones award, a co-founder of UAC, and chairman of NCGR. In September 1984, at the time of community rebellion to AFA policies, he became a focus figure with his disbarment from AFA.

He had two marriages and divorces with a total of five kids when he made a third marriage, on 2 October 1978, to Maria Kay Simms.

In May 1989, Michelsen had back pain that was not relieved by chiropractic adjustments. He felt fine and fit with no other symptoms of the cancer that had spread throughout his bone structure, that was diagnosed the following month. With hormonal injections, a new treatment that had about a 40% success record in the past ten years in Europe, he went into remission for about six months. By December 1989 the cancer began to mutate and he no longer responded to the treatment. During early 1990, diet and alternate healing methods failed to have the desired result, and he died on 15 May 1990, San Diego, CA.

Michelsen left a major legacy to astrology in programming and publishing the first computer-generated ephemeris in 1976, the first of the widely used American Ephemeris series, setting new standards for accuracy. At the 1992 UAC Regulus Awards he was posthumously awarded a Lifetime Achievement Award.



  • Social : Left group 15 September 1984 (Disbarred from AFA)
    chart Placidus Equal_H.
  • Relationship : Marriage 2 October 1987 (Maria Kay Simms)
    chart Placidus Equal_H.
  • Health : Medical diagnosis June 1989 (Bone cancer diagnosed)
    chart Placidus Equal_H.
  • Death by Disease May 1990 (Prostate cancer, age 59 plus four days)
    chart Placidus Equal_H.
  • Work : Prize 1992 (UAC Lifetime Achievement Award, posthumously)

Source Notes

LMR quotes him 1978, given as CST. In 2015, Wayne Turner asked Maria Simms about what she knew of the source of this precise to the minute time. She replied "As I remember, Neil's citing of his exact birth time was a combination of what he'd been told by his parents as the approximate time, plus his own experience with calculation after he'd become interested in astrology and decide to try to refine the time he'd been told." Therefore, the Rodden Rating was adjusted to C = rectified.

In April 2021 Marc Penfield sent to Astrodienst a letter giving Michelsen's birth time as 5:49 AM, no source provided, only with the comment, "He was my third publisher back in the early 1980's."


  • Diagnoses : Major Diseases : Cancer (Prostate)
  • Family : Relationship : Number of Marriages (Three)
  • Family : Parenting : Kids more than 3 (Five)
  • Vocation : Business : Business owner (ACS)
  • Vocation : Computer : Programmer
  • Vocation : Occult Fields : Astrologer (Student)
  • Vocation : Writers : Publisher/ Editor (Publisher)
  • Notable : Awards : Vocational award (Marc Edmund Jones Award)
  • Notable : Book Collection : Occult/ Misc. Collection