Sun opposite Saturn (orb 1.8°) puts the two planets face to face, with visible back-and-forth or tension. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Sun in Pisces in House 1 brings identity, ego, father figure, visibility, and direction into House 1 (presence, body, and the way experience is entered), with Pisces style (imagination, faith, compassion, dream, and permeability); Saturn in Virgo in House 7 brings discipline, constraint, endurance, and mastery into House 7 (relationship, confrontation, and the mirror of others), with Virgo style (precision, method, usefulness, and attention to detail).
Concrete conflict: this aspect sets personal direction, ego, or father image against Saturn pressure: duty, limits, fear, authority, or a demanding father image. Visible angle: Sun near the Rising sign (orb 5°) touches an angle; this aspect is easier to notice through first impression, body language, reflexes, and entry style. The house conflict is between House 1 (presence, body, and the way experience is entered) and House 7 (relationship, confrontation, and the mirror of others); pressure in one field tends to reactivate the other.