I have no birth time so I have used the thema mundi chart which is set for noon and shown here without houses and the Moon‘s movement through his birthday is between 10-23 of Cancer.
The solar eclipse of August 21 2017 aspects his Sun with an orb of 2-3 degrees. While this might be considered to be the maximum orb allowable it does highlight his natal Sun, arguably one of the most important points in any horoscope.
Solar eclipses are associated with unexpected surprises where hidden forces are released and the situation changes very quickly. In the context of Barnaby‘s position as deputy leader of Australia and the challenger to his right to hold that position this eclipse suggests that his tenure is under serious threat.
Checking on the Aries ingress of the Sun for Australia we see that the solar eclipse of August 17 conjoins the 11th cusp. The 10th house represents the government and in particular the Prime Minister (PM). The 11th house, as the derived 2nd house from the 10th house, represents the support for the PM. The deputy PM is the PM’s most primary support and is represented by the 11th house. The 11th house also represents the Liberal and National Party MPs whose votes the PM relies upon to form government.
The 11th house cusp is closely aspected by the Moon and Saturn. Saturn rules the opposition because it rules the sign opposite to the government’s 10th house, and the Moon as 9th house ruler represents the high court.
It does not look good for the government or for Barnaby Joyce. Based on the relationship between the solar eclipse with Barnaby Joyce‘s horoscope and the 2017 Aries Ingress horoscope for Australia it is most likely that Barnaby Joyce will be forced to stand down.