Celestial: Pluto Discovery

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Celestial: Pluto Discovery Gender: N/A
born on 18 February 1930 at 16:00 (= 4:00 PM )
Place Flagstaff AZ, USA, 35n11, 111w39
Timezone MST h7w (is standard time)
Data source
Timed documented source, news
Rodden Rating A
Collector: Rodden
Astrology data s_su.18.gif s_aqucol.18.gif 29°35' s_mo.18.gif s_scocol.18.gif 13°15 Asc.s_leocol.18.gif 03°34'


Discovery of the planet Pluto by Clyde Tombaugh, (born Feb 4, 1906, on a farm near Streator, Illinois.) The official announcement of the planet's discovery was made on 3/12/1930 in the evening.

On August 24, 2006, at a meeting in Prague, the International Astronomers' Union declared that Pluto is no longer a planet. The group came up with new guidelines that downsize the solar system from nine planets to eight. Pluto was relegated to a new category labeled "dwarf planets." Pluto's orbit and small size are problematic and do not fit the new guidelines that require a planet to be: "a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a ... Nearly round shape, and has cleared the neighborhood around its orbit."

Maggie Hyde writes in ISAR e-zine vol. 408 that " A fascinating video of the IAU session which voted to demote Pluto is

available online at: http://www.astronomy2006.com/media-stream-archive.php

The session began on time at 2:00pm local time and if you fast-forward to

1:44:29 hours, you come to the point where the Chair announces the motion

carried on Resolution 6A concerning Pluto as a dwarf planet. This gives the

demotion map a time of 03:44:29 pm CEST, (13:44:29 UT) 24 August 2006, Prague. Mercury trines a rising Pluto. Pluto physically crosses the astronomical horizon at Prague at 3:46:54pm

CED (within three minutes of the first vote demoting Pluto to dwarf, assuming a start of afternoon session promptly at 2:00:00pm). The second

(and aborted) part of the resolution, significantly about the naming of

similar objects as 'Plutonian', followed soon after Pluto had risen. A

difficult birth, but a great synchronicity for the astronomers."


Source Notes

Duane Eaks, F.A.A. president, states data in the FAA Journal 12/2001. Same information on the database included with Janus 3 software. (Prier Wintle in Considerations November 2001 gives the discovery date as 1/21/1930, formally announced on 3/12/1930.). In the ISAR International Newsletter of September 12, 2006, vol. 404, Joyce Hoen writes "Joylynn Hill's book The Discovery of the Outer planets and she too does give February 18, 1930, but at 4.13 pm MST, Flagstaff, AZ."


  • Mundane : Medical/Science : Space
  • Mundane : Misc. Mundane : Discoveries (Celestial: Pluto)