Crossing: Mars / Ares

The planet that reverses direction without warning — mapped to the god who embodies chaos, unpredictability, and uncontrollable violence.

Two distinct observable phenomena converge on the same mythological character.

The Red

Mars's blood-red colour from iron oxide was visible to every naked-eye observer in antiquity. Every culture that named it associated it with war, blood, or danger:

• Greek: Ares (war)
• Roman: Mars (war)
• Babylonian: Nergal (plague and war)
• Egyptian: Horus the Red
• Indian: Mangal (associated with conflict)

The colour → blood → war correspondence is the simplest and most obvious crossing — observed, immediate, requiring no astronomical sophistication.

The Retrograde

But the more interesting crossing is behavioural. Every ~780 days, Mars undergoes apparent retrograde motion for approximately 72 days — appearing to reverse direction against the background stars, then resuming forward motion.

To ancient observers without an orbital model, this was genuinely alarming. Mars would track steadily eastward, then stop, reverse, move westward for weeks, stop again, and resume eastward movement — with no apparent pattern or cause. No other bright planet was as dramatically, visibly erratic. Jupiter and Saturn have retrograde periods too, but Mars's is the most dramatic relative to its normal motion.

The Mythological Parallel

Ares in the *Iliad* is described by Zeus himself as "the most hateful of all gods" — forever quarrelling, switching sides, defeated in battle despite being the god of war. He fights on the Trojan side, promises Athena he'll switch to the Greeks, then is persuaded by Aphrodite to remain Trojan. He is wounded by the mortal Diomedes. He is trapped in a jar for thirteen months.

The mythological Ares is unpredictable, reversible, unreliable — just as Mars in the sky reverses direction, seems to fight against its own trajectory, and confounds expectation.

The moons Phobos (Fear) and Deimos (Dread) — Ares's attendants in myth — are also Mars's actual moons, discovered 1877 and named accordingly. One of the clearest deliberate mythology-astronomy pairings in the solar system.

Crossing Type

observed — both the red colour and the retrograde motion were directly visible. The erratic, chaotic quality of Mars's motion in the sky directly reflects the mythological characterisation of Ares as unpredictable, violent, and uncontrolled.

The Greeks didn't need to know *why* Mars went retrograde to notice that it did — and to recognise that a god of chaos was the right patron for a planet that behaved chaotically.