Demonstration of Solar Arcs. Donovan's chart.

1
http://www.astro.com/astro-databank/Donovan

It is so rare and wonderful to get a chart with a Scottish birth, giving an exact time of birth from a birth certificate.

Donovan's Sun is 19 degrees Taurus, and it is natally conjunct the antiscion of his Pluto, 9.5 degrees Leo gives an antiscion of 20.5 degrees Taurus. His Ascendant is 10 degrees Gemini.

He became famous, and very wealthy, at the age of 19 in 1965, when the converse Solar Arc of his Ascendant was conjunct his natal Sun and natal Pluto antiscion. While at the same time transiting Neptune in 19 or 20 degrees Scorpio was opposing.

The song "Try for the Sun" (1965) seems appropriate https://www.youtube.com/watch?v=XkkGkMNkz9k

I have noticed many times that when you get a Solar Arc from one of the chart angles to a personal planet at the same time as a transit by conjunction, square or opposition to that personal planet from Pluto, Neptune or IsisTranspluto, the effects are very powerful and last forever.