☉ Sun ☍ Opposition ♂ Mars

180° · major aspect · challenging · default orb ±8°

Sun opposite Mars sets vitality, honor, and command against war, heat, and contention across the full diameter of the zodiac, a figure Ptolemy classes as obstructive and the later tradition reads as open confrontation. Sources tie the pair to disputes with authority, rivalries for rank, litigation and campaigning, and in medical astrology to fevers at their crisis. The astronomy sharpens the symbolism: a superior planet opposite the Sun is at its nearest and brightest, rising at sunset, so Mars opposed to the light burns reddest exactly when the doctrine calls him most confrontational and least restrained.

Traditional reading

At opposition Mars is also retrograde, a debility the classical authors weigh alongside the aspect itself, the planet doubled in difficulty by station and backward motion. The Sun, the faster body, applies. Sect adds its usual verdict on the pair, Mars serving the night and the Sun leading the day, so the malefic here confronts the very light of the contrary team; Hellenistic doctrine reads a day-chart Mars as harsher, and an opposition to the sect light as the sharpest form of that testimony.

Classical reading

Ptolemy lists opposition as one of the five Ptolemaic aspects, formed by the diameter (180°). Classically described as obstructive or confrontational.