Given the part that they played in each other's destiny there is surprisingly little synastry between Harry and Voldemort, particularly when you consider that each carried a piece of the other's soul after Voldemort's first attack on Harry. Certain themes are repeated, for example Voldemort has Pluto conjunct the North Node, while Harry has Pluto sextile and trine the nodal axis. The Sun in each chart squares Mars in the other chart. Perhaps in this we hear Harry's words to Voldemort 'It's just you and me. Neither can live while the other survives'.
Both Harry and Voldemort have a Moon-Saturn aspect. While Voldemort has them conjoined, Harry has them in opposition. Like Voldemort, Harry lost his mother Lily, as a baby. In Harry's case she gave her life to save him from Voldemort. We can imagine how Voldemort must have contrasted this act of great love with his own loveless childhood. On the day of Harry's birth the Moon was at 27 Pisces at noon, conjunct Voldemort's Uranus at 25 Pisces, and trine Voldemort's own Moon at 27 Scorpio conjunct Saturn. So Lily's great sacrifice, activated Voldemort's jealousy of Harry, and feelings of loss at his early separation from his own mother. Harry appears to be aware of this and frequently uses it as a weapon in their verbal battles. In Harry Potter and the Chamber of Secrets, Harry says 'You're the weak one! You've never known love, or friendship. And I feel sorry for you'. Perhaps this as much as anything else fueled Voldemort's determination to kill Harry. For whatever reason, the degree of Harry's Moon, 27 Pisces assumes some significance in the conflict that ensued.
At the time of the attack on Harry, Voldemort's Venus had progressed to 27 Pisces and had conjoined Harry's Moon. This would suggest that Voldemort must have been greatly moved by Lily's actions, although a conjunction between pr Venus and pr Uranus may have resulted in him cutting himself off from these feelings. As this attack also resulted in the disembodiment of Voldemort's soul, we can speculate on the importance of Venus in his natal chart. Chart ruler?
For those who have yet to read the final book – SPOILER ALERT!
On the day their final conflict began, tr Venus was at the significant degree of 27 Pisces, conjunct Harry's Moon and Voldemort's Uranus. As the conflict ended it conjoined his progressed Venus at 28 degrees. In this final battle the theme of sacrifice once more shows itself as this time Harry is prepared to die himself to save his friends from Voldemort. Once again as this degree is activated, Harry asks 'Accident was it, when my mother died to save me?' And once again Voldemort is defeated, this time finally. As He-Who-Must-Not-Be-Named hit the floor for the last time, we are told that the 'fierce new sun dazzled the windows' and 'the sun rose steadily over Hogwarths'.