Purva Ashadha is the twentieth, ruled by Venus, its symbol a fan (also a winnowing basket, also a tusk), its deity Āpas — the waters. The name means 'the earlier, the invincible'.
Mechanically Venus is attraction and persuasion; Āpas is water. Together: water's way of winning — no head-on collision and no retreat either; when it rises you can't stop it, because there's no point to push back against. So this segment is about unyieldingness and persuasion: people end up convinced rather than overpowered, by persistence rather than force.
Where you'll recognise it: hard to talk round, a quiet confidence, skilled at bringing people to your view, high resilience under setback, rarely conceding error, and a natural interest in cleansing and starting over. Running well, you're the most persuasive and the most durable: carrying people with you, outlasting a long fight, letting an idea become consensus. Stuck, you hold out until you can't hear — persistence hardened into never revising, charm used to route around the objection you should face. Mula before it digs the root; Uttara Ashadha after it is the tusk: after rising water comes the slow growth that doesn't snap.