Accession or Coronation chart? Which is the key marker? Birth versus baptism might be a reasonable analogy and looking back it does seem the Accession chart is the relevant one. Accession happens the moment the old monarch dies and there is usually a proclamation on the same or next day with a coronation some months later.
Queen Elizabeth 1 was handed the Royal baton when her half-sister Mary died on 17 November 1558 JC at 6am and her Coronation came on 15 January 1559 JC circa 7.30am.
Her death on 24 March 1603 JC at 2.30am most clearly affected the Accession chart with the tr Neptune in Virgo opposition Venus square Saturn in Sagittarius in hard aspect to the Sun square Pluto opposition Midheaven. On the Coronation chart there is not much showing at that point.
Queen Victoria acceded on the death of William IV in the early hours of 20 June 1837 with a Coronation on 28 June 1938 around 12noon. When she died on 22 January 1901 at 6.30pm in Ryde, England, on the Accession chart tr Neptune was approaching a conjunction to the Sun and tr Saturn (Venus )in Capricorn were trine the Mars and sextile the Uranus with again less showing on the Coronation chart.
In Elizabeth 11’s case she acceded sometime over night into the 6 February 1952 and was proclaimed Queen at 5 pm that day. Her Coronation was on 2 June 1953 at circa 11.20 am.
When she died the transits to the Accession chart were starkly obvious with the rock-solid Aquarius Sun opposition Pluto being hard-aspected by tr Saturn (Moon) square Uranus North Node causing a massive upheaval and a dead-halt. The Coronation chart had some hints but was nothing like as clear.
The time of the Queen’s death is recorded as 3.10pm which will be the chart of Charles 111’s Accession. It is less problematic than the Proclamation chart. Though it could be divisive/argumentative with Mars close to the Descendant and preachy with such an opinionated 9th and communicative 3rd house. Intense Pluto and Saturn in Aquarius in the 3rd along with a muddled Neptune will make for stubborn insistence on beliefs. Plus the marginally autocratic Saturn square Uranus – it could be high-handed. A much-travelled Sun Venus in the 9th and along with Mercury suggest a good deal of foreign travel.
What is noteworthy if perhaps a touch previous is that the Fixed Moon Saturn square Uranus on his Accession chart will be upended by tr Pluto in Aquarius across the mid 2030s which is the point at which Princes William will be at a crossroads. The Eclipse Saros cycle on the day he was born ends in 2036, leading some astrologers to suggest he could be the last monarch. Charles will be 88 then and labouring under tr Pluto square his Scorpio Sun.
Add On: The present Royals are part of the Hanoverian Monarchy which moved onto the throne on 1 August 1714 with the coronation of King George 1. That chart s equally coming to a grinding halt in the mid 2030s with the Solar Arc Pluto conjunct the Mars for the first time and tr Pluto opposing the Leo Sun. Even before then the late 2020s sees the Solar Arc Saturn conjunct the Pluto which will put up warning flags.