Secondary Progressions Explained: The Day-for-a-Year Method

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Secondary progressions are a symbolic timing technique. They take the planets as they stood in the days just after you were born and read each day as one year of your life: the sky one day after birth stands for your first birthday, the sky thirty days after birth for your thirtieth. The positions that result are called progressed positions, and they are compared with your natal chart.

That makes them different from transits. A transit is a real planet in today's sky touching a point in your natal chart; the transits overview and how transits work cover that technique. A progression is not a planet anywhere in today's sky. It is a calculated position from a few weeks after your birth, read by a fixed rule. The two methods sit in the same part of this library because both are used for timing, not because a progression is a kind of transit.

Educational page. Secondary progressions are an astrological technique discussed by Astrologist.com, not a feature of the site. The free birth chart is a natal chart only: it does not calculate a progressed chart, progressed positions, a progression timeline or a progression report. The figures below were calculated offline with the same planetary routines the free chart uses.

The day-for-a-year rule

The convention used across these guides is short: at exact age N years, use the planetary positions N ephemeris days after the birth instant. The clock time stays the same in Universal Time. Someone born at 12:00 UT on 5 January reads their age-33 progressions from the sky at 12:00 UT on 7 February, thirty-three days later.

Between birthdays the progressed planets keep moving, so a date such as your 33rd birthday plus four months needs a fraction of a day. Astrologers handle that fraction in slightly different ways. The worked method in how to calculate your secondary progressions gives one transparent way to do it, labelled as that page's convention, not as the only definition of the technique.

Everything else follows the natal chart: geocentric positions, the Tropical zodiac, and the same planetary routines. Progressions are not a separate zodiac or a different chart system.

Natal, transits and progressions side by side

The figures in the table are the heart of the technique. Because one day of planetary motion is stretched over a year, only the fast movers travel far enough to matter.

What moves enough to be useful

Speeds below were measured with the free chart's routines for every day from 1920 to 2060.

• Progressed Sun. The real Sun moves 0.95° to 1.02° a day, so the progressed Sun moves roughly one degree per year of life and needs 29.5 to 31.5 years to cross a sign. That is roughly one sign per 30 years, so two or three sign changes are common across a long life, depending on the natal degree and the Sun's actual motion. Ruben, the fictional example used in these guides (London, 5 January 1993, 12:00), has a natal Sun at 15°10' Capricorn; his progressed Sun reached Aquarius at about 14½, reaches Pisces at about 44 and would reach Aries at about 74.
• Progressed Moon. The real Moon moves 11.8° to 15.4° a day, so the progressed Moon moves about 12° to 15° a year and changes sign every two to two and a half years. It is the most-read progressed factor and has its own guide: the progressed Moon.
• Mercury, Venus and Mars. Their speed varies a lot, and each can slow down, stop and change direction by progression within a lifetime. A progressed Mercury can move well over a degree a year; a progressed Mars near a station may move a few minutes of arc.
• Jupiter to Pluto. These generally change much less and are usually background factors in this technique. Measurable movement still happens over decades: Ruben's progressed Saturn has moved 3°50' by age 33, while his progressed Pluto has moved about 40'.

How long each planet takes to cross a sign in the real sky is set out in how long planets stay in each sign; progressions use the same speeds, read on a different time scale.

This batch of guides uses the ten planets from the Sun to Pluto as progressed bodies. The Lunar Nodes, Chiron, Lilith and the chart angles are left out, not because they do not move, but because how to progress them is outside the method frozen for these pages.

Signs and natal houses

A progressed planet changing sign is read as a gradual change in style: the planet still describes the same thing, now expressed in a new way. A progressed Sun moving from Capricorn into Aquarius, for example, keeps the Sun's meaning but shifts its tone. Planet meanings stay the starting point: planet is what, sign is how.

Houses need more care. There are several competing methods for moving the Ascendant, Midheaven and house cusps forward, including solar arc in longitude, the Naibod rate in right ascension and methods based on the progressed sidereal time, and they give different results. These guides do not choose one and give no progressed angles or progressed house cusps. With a reliable birth time, a progressed planet can be placed in your natal houses, the fixed cusps from your free chart. That is a natal-house overlay, not a progressed house calculation. The site's usual rules for those houses still apply, including Equal houses from the Ascendant for births above 66° latitude; see the houses overview.

Progressed aspects

The main reading is a progressed planet forming one of the five major aspects to a natal planet: conjunction, sextile, square, trine or opposition. Progressed-to-progressed aspects, between two progressed planets, are also used.

Orbs. Because progressed planets move so slowly, many astrologers use a tight orb for these contacts, often quoted as about 1° or less, with variation between authors. That is a convention, not a site rule, and it is deliberately not the 8° and 6° orbs the free chart uses for natal aspects (aspect orbs explains those). The calculator does not look for progressed aspects at all, and minor aspects are not covered here.

Applying and separating. Some astrologers give more weight to a progressed contact while it is closing in than after it has passed. That is a useful distinction to understand, but the standard Astrologist.com calculator does not distinguish applying from separating aspects, and these pages do not turn it into a rule.

Duration. A progressed Sun takes about two years to pass through a 1° orb on each side of a contact. The progressed Moon does it in a few months. These are periods, not days.

Progressed stations

Mercury, Venus and Mars can change direction by progression. If one of them was about to turn retrograde or direct in the weeks after your birth, the progressed planet will make that turn at the matching age, and then stay close to the same degree for years.

Ruben shows it. He was born with Mars retrograde in Cancer. His progressed Mars keeps moving backward, slower each year, and turns direct just before age 41, at 8°40' Cancer. A natal retrograde planet is covered in what is a natal retrograde planet; the way a real-sky station stretches a transit is in stationary transits. A progressed station is the slow-motion version of the same geometry.

Themes, not events

Progressions are a symbolic technique, not a forecast of future planetary positions and not a cause of anything. Astrologers who use them read them as developmental themes: a slow change of emphasis, a period in which one part of the chart is under discussion. Nothing happens because a progressed planet reaches a degree, and no contact on these pages is a prediction of an event, a relationship outcome, a health change or money.

Some astrologers also use progressions when testing a doubtful birth time, comparing progressed contacts with dates of past life changes; birth time rectification describes that practice and its limits. It is an example of how progressions are used, not proof that rectification is reliable.

Birth time and progressions

Under day-for-a-year, one hour of uncertainty in the birth instant corresponds to about 365.2422 / 24 = 15.22 days of life in when the same progressed event is assigned. That is a mapping fact, not an error bar for every contact: near a station, with repeat crossings, or when the natal point being aspected also depends on the birth time, the practical shift can be larger or smaller. With no birth time at all, the window is about one life-year in total, or about six months either side of a noon reference, and the noon reference is never your birth time. Progressed house placements and contacts to the natal angles need a reliable time.

Other directing methods

These are different techniques and are not covered here.

• Solar arc directions move every point in the chart forward by the same arc the progressed Sun has travelled.
• Tertiary and minor progressions use other ratios, such as one day for a lunar month of life or one lunar month for a year.
• Converse progressions count the days backward from birth instead of forward.
• Primary directions are based on the daily turning of the sky after birth and need exact angles.

Next steps

The working method, with Ruben's progressed chart at age 33 worked through, is in how to calculate your secondary progressions. The progressed Moon's sign changes, house stays and 27-year cycle are in the progressed Moon. If you want to compare progressions with real-sky timing, how to read transits without a tool uses the same ephemeris for a different date. The methodology page lists the site's calculation choices, and you can ask the Astrologist about progressions as a concept or about a progressed position you have worked out yourself; it does not compute progressed positions or dates.

Related articles

• The Progressed Moon
• How to Calculate Your Secondary Progressions
• Astrology Transits Overview
• What Is a Natal Retrograde Planet?
• Aspect Orbs in Astrology
• Birth Time Rectification