Retrograde motion (Vakri)

Vakri means crooked or backward-moving. A graha is retrograde when, seen from Earth, it appears to reverse direction against the background stars.

The astronomy first

Nothing actually reverses. Retrogression is a perspective effect caused by Earth and the other planet moving at different speeds on different orbits — the same illusion as a slower car appearing to slide backwards when you overtake it.

What follows from that:

• The Sun and Moon are never retrograde. The Sun is what we orbit; the Moon orbits us. Neither can produce the effect.
• Mercury, Venus, Mars, Jupiter and Saturn all go retrograde, periodically and predictably.
• Rahu and Ketu are always retrograde in mean motion — they move backwards through the zodiac permanently. Calling them "retrograde" is therefore not a special condition, just their normal state.

A retrograde planet is also, necessarily, near its closest approach to Earth, and so at its brightest. That physical fact matters for the next section.

Why the interpretation is contested

Here the tradition genuinely divides, and you should know that rather than be handed one answer.

The strength reading. In the Shadbala system, chesta bala — "motional strength" — is at or near maximum for a retrograde planet. On this reasoning a retrograde graha is stronger, and several classical authorities treat it as approaching exaltation-like force. The brightness argument supports this: the planet is closest and most visible.

The obstruction reading. Other authorities read vakri literally — motion against the natural order — and take it as indicating results that are delayed, internalised, or that arrive by an unexpected route. In this reading a retrograde graha turns its significations inward.

The modern popular reading. "Mercury retrograde" as a period of general communication chaos is largely a late-twentieth-century Western popular idea. It has spread widely, including into Indian popular astrology, but it is not what classical Jyotish texts say, and it concerns transits rather than natal placement.

These are not reconcilable by picking the strongest-sounding source. They are different traditions of reading, and an honest teacher says so.

What is not disputed

A few points most authorities do share:

• Retrogression is a modifier, not a dignity. It does not replace exaltation, debilitation or house position.
• A retrograde graha entering the previous sign by retrograde motion is treated by some as taking on that sign's character.
• Combustion interacts with it. A retrograde Mercury or Venus has a tighter combustion orb than a direct one — Lesson 15 covers this.
• The effect is stronger in natal charts than in transit for the strength reading, and stronger in transit than natally for the obstruction reading. Which tells you something about how much confidence either deserves.

How to hold it

Note retrogression when you see it, record which reading you are applying, and see whether the chart supports it. Do not treat it as decisive. A retrograde Saturn in the 10th is still, first and foremost, Saturn in the 10th.