2015
Mercury was retrograde three times in 2015, for 69 days in all: in Aquarius in midwinter, in Gemini in late spring and in Libra in early autumn.
The year wound into a circle, January at the top. Distance from the centre is Mercury’s daily motion; wherever the trace dips inside the zero circle, Mercury is moving backward: three dips, three retrogrades. Each shaded block runs from the station-retrograde day to the station-direct day, both counted, in UTC; the trace is sampled at noon, so it can cross zero a day inside or outside the block.
Three retrogrades
Aquarius, Gemini, Libra.
| Station R | Station D | Sign | Shadow in | Shadow out | Days |
|---|---|---|---|---|---|
| 21 Jan 2015 | 11 Feb 2015 | Aquarius | 5 Jan 2015 | 3 Mar 2015 | 22 |
| 19 May 2015 | 11 Jun 2015 | Gemini | 4 May 2015 | 27 Jun 2015 | 24 |
| 17 Sep 2015 | 9 Oct 2015 | Libra | 28 Aug 2015 | 24 Oct 2015 | 23 |
| Total | 69 |
Every planet in 2015
Nine retrogrades touched 2015 across the eight planets.
One row per planet. The solid band runs from the day of the station retrograde to the day of the station direct, both counted; the hatched band is the shadow on either side, from the day the planet first reaches the degree it will retreat to until the day it passes the degree where it turned. Days are UTC calendar days; a planet’s sign in the readout is its apparent geocentric longitude at noon UTC. Point at the figure, or focus it and use the arrow keys, to read any day.
Computed from the ephemeris and checked against NASA JPL Horizons; times UTC. Every planet’s 2015 windows as data: JSON · CSV · how the dates are computed
Questions
- 01When was Mercury retrograde in 2015?
- Mercury was retrograde January 21 – February 11 in Aquarius; May 19 – June 11 in Gemini; September 17 – October 9 in Libra (station retrograde to station direct). Each window is bracketed by a pre- and post-shadow period — the full dates are in the table above.
- 02How many retrogrades happened in 2015?
- 9 retrograde windows touched 2015 across the eight planets: Mercury 3×, Venus 1×, Jupiter 1×, Saturn 1×, Uranus 1×, Neptune 1×, Pluto 1×. Because the outer planets are each retrograde for four to five months at a time, some part of the sky was retrograde for most of the year.
- 03Which planets were not retrograde in 2015?
- Mars ran direct all year — its next retrograde started April 17, 2016 in Sagittarius.
- 04What is a retrograde shadow period?
- The shadow (or “retroshade”) is the stretch of sky a planet covers three times: once moving forward, once apparently backward, once forward again. The pre-shadow begins when the planet first crosses the degree it will later retrograde back to; the post-shadow ends when it finally re-passes the degree where it first stationed. The ledger above lists both dates for each Mercury window, and the station chart draws the shadow of every planet’s.
Station alerts
A heads-up before every turn.
An email 3 days before the shadow and each station, one when it turns retrograde, and an all‑clear when it goes direct. Plus a note on each Mercury cazimi.
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