Mars Transits to Natal Sun: Why Some Contacts Come in Threes

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Mars transits to natal Sun are the moments when moving Mars stands exactly 0°, 60°, 90°, 120° or 180° from the degree the Sun held at your birth, counted on both sides of the circle, so eight target points. Your natal Sun is fixed; it was set at one instant. The Sun in today's sky keeps moving, about a degree a day, and it matters here only because Mars's backward loops are tied to it.

Most of the time Mars crosses a natal Sun target once and moves on. Sometimes it crosses, turns back over the same degree, and crosses a third time. This page asks why the conjunctions in particular came singly or in threes for one invented birth, and how that lines up with where the moving Sun was. Measured over 2000 to 2030:

• Fifteen of the sixteen conjunctions were a single forward pass. Each one fell less than three months from the person's birthday, the date the moving Sun returns to the natal Sun's degree.
• One conjunction came in three passes, in 2026 to 2027. Its backward crossing, on 16 March 2027, fell 152 days before the next birthday, with the moving Sun in late Pisces, 146° away from the natal Sun.
• Across all eight contact types the same split held. Mars was never more than 107.6° from the moving Sun at a single crossing, and between 146.4° and 178.9° from it at the backward crossing of every three-pass contact.

The Sun is often read as identity, vitality and what a person is trying to become, and Mars as drive and effort. A Mars contact to the natal Sun is one optional prompt for reflection. It does not cause anything and does not foretell anything.

Educational guide only. Astrologist.com has no transit tool: no transit calendar, return chart or timing report. The free birth chart shows natal positions only, and every date below was computed offline for an invented person.

The example birth and its natal Sun

This is the same invented person as on the Mars return page, where moving Mars is measured against natal Mars instead. The birth itself was first used on Saturn transits to natal Neptune, and it was carried over as it stood, under a rule set down before a single Mars date had been worked out. No birthday or Sun position was chosen to produce a pattern.

• Birth: 10:20 local time (08:20 UT, Belgian summer time) on 15 August 1989, Antwerp.
• Natal Sun: unrounded 142.488317°, which is 22°29'17.9" Leo, advancing 0.961° a day at birth. The chart stores 142.49° and shows 22°29' Leo. Only this single value is used as the target.
• Period: 1 January 2000 at 00:00 UT, up to but not including 1 January 2030 at 00:00 UT, when this person is aged 10.38 to 40.38. The period was fixed in advance.
• How it was computed: Mars from the astronomia VSOP87B routine the chart itself uses, and the moving Sun from the chart's own solar routine, both with the chart's conversion from Universal Time to ephemeris time. An hourly scan of Mars found each crossing, which was then narrowed to under thirty seconds, while each of Mars's turning points was solved on its own to within a minute. These are numerical tolerances only. Dates are given in UT; those after October 2026 are projections of the model, not forecasts.

Grouping. Mars's path is followed without a reset at 0° Aries, so each target becomes a fresh level on every lap. One contact is all the crossings of a single level while Mars remains within 30° of it, and it counts as complete once Mars has been more than 30° from that level both before and after. A turning point lying exactly on a target would be reported separately as a touch.

All eight contacts in the window

Mars covered fifteen laps plus 347.13° in the thirty years, from 27°34' Aquarius to 14°42' Aquarius, with 28 turning points. Because it started a little past the opposition point and finished a little before it, the opposition target was reached on fifteen laps and every other target on sixteen.

That is 127 contacts and 139 crossings, every contact complete inside the window: 121 single forward crossings and 6 contacts of three crossings (forward, backward, forward), whose first and last crossings were 130.2 to 162.0 days apart. That interval is simply how long the three crossings took. It is not a period of effect or an orb.

No turning point sat on a target. The closest was the forward turn of 29 June 2016 at 23°03' Scorpio, 0.57° past the waxing square point, so there are no touches. Mars was at least 5.09° from every target when the window opened and 7.79° when it closed.

Mars's loops and the moving Sun

Every one of the 14 backward loops in the window contained a sky opposition, the moment Mars and the moving Sun stand 180° apart. At all 28 turning points Mars was 129.1° to 146.3° from the moving Sun. That is the astronomy described in retrograde planets and the Sun, here measured rather than assumed.

A contact gets three crossings only when a loop straddles its target: Mars turns backward somewhere past the target and forward again somewhere before it. Six loops did that for one of the eight targets, and the other eight loops missed every target:

The conjunctions, set against the moving Sun

The comparison rule was set before any of these dates were looked at: for every crossing of the natal Sun's own degree, note where the moving Sun was, measured from the natal Sun, and how many days separate the crossing from the nearest birthday (the moment the moving Sun returns to 22°29'17.9" Leo).

What the example shows. The fifteen single conjunctions all fell between 84.1 days before and 73.2 days after a birthday, with the moving Sun within 80.4° of the natal Sun and therefore Mars, sitting on the natal Sun, within 80.4° of the moving Sun. The one three-pass conjunction is the exception: its first crossing came 86 days after the 2026 birthday, and its backward crossing came when Mars was 146.4° from the moving Sun, about five months before the 2027 birthday.

Why it lines up that way, as geometry. For Mars to move backward over the natal Sun's degree, it has to be near opposition to the moving Sun, so the moving Sun has to be roughly opposite the natal Sun, which puts it far from the birthday. A fast forward pass needs no such alignment, and in this example the singles clustered nearer the birthday. That explanation fits these thirty years of data for this one birth; it is not offered as a rule for every chart, and with only one three-pass conjunction in the window it rests on a single case.

A near miss. The loop of December 2009 to March 2010 turned backward at 19°41' Leo, 2.79° short of the natal Sun, so the following contact on 23 May 2010 stayed single. Its sky opposition, on 29 January 2010 at 9°47' Leo, was only 12.69° from the natal Sun, yet that did not produce a repeat: what decides the count is whether the loop reaches the natal degree, not how close the opposition is.

A short gap is not the same as a repeat. The single conjunction of 27 October 2011 came only 1.43 years after the one before. Mars passed the natal Sun on its way out to the 2012 loop, which then turned forward at 3°40' Virgo without coming back as far as Leo.

Sky oppositions are a different event

A sky Sun-Mars opposition involves only the two moving bodies and is the same for everyone. Mars conjunct your natal Sun involves your fixed natal degree. They can be near each other on the calendar, but they are separate events, and neither one stands in for the other.

In the window there were 14 sky oppositions. The one nearest to this natal Sun fell on 19 February 2027 at 0°46' Virgo, 8.28° beyond the natal degree, 25 days before the backward conjunction crossing of 16 March 2027. The other 13 lay 12.69° to 167.47° from the natal Sun. Mars and the Sun also met in the sky 14 times inside the window, for example on 10 August 2002 at 18°06' Leo, a week before the single conjunction of 17 August 2002. That sky meeting is likewise not a contact to the natal Sun. Natal Sun-Mars aspects, where both points belong to the birth chart, are another subject again; see Sun conjunct Mars (natal) and Sun opposite Mars (natal).

When the birth time is not known

The local Antwerp date covers 22:00 UT on 14 August up to, but not including, 22:00 UT on 15 August 1989. Across it the natal Sun climbs steadily from 142.074636° to a limit of 143.035542° at 24:00, so 0.961° in total, with no wrap; the last whole minute, 23:59, gives 143.034874°.

Every Mars turning point in the window, and Mars at the window's two edges, were tested against that span after shifting it by each of the eight angles and every whole lap. None fell inside, so no clock time on that date changes any count. The margin is narrow in one place: the forward turn of 29 June 2016 sits only 0.022° beyond the waxing square span. A natal Sun that much further along, which this date never reaches, would turn the single waxing square contact of 16 February 2016 into a three-pass contact. The window edges are 4.54° and 7.37° away.

As a separate sample, the contacts were recalculated for 145 clock times (each ten minutes from 00:00 to 23:50 local time, and 23:59). All 145 gave the same contacts with the same directions. Crossing dates shifted by 1.21 to 6.69 days across the samples, the most for the slow crossings beside the 2005 and 2027 loops. Those spreads describe the sampled times only, not proven bounds. With no birth time, the chart places the Sun at local noon and shows no houses.

Stored and displayed values, and a Swiss cross-check

Swapping in the stored 142.49° moved the crossings by 0.05 to 0.26 hours; two of them moved to the next UT date (27 to 28 November 2010 and 20 to 21 May 2013) and no count changed. The displayed 22°29' Leo, taken as 142.4833°, moved them by 0.15 to 0.77 hours, with one UT date change (18 to 17 April 2028) and no change of count. A display of 22°29' Leo covers values from 142.478° to just under 142.495°, and every turning-point level is at least 0.56° from that range.

Only as an outside check, the same quantities were compared with the Swiss Ephemeris. Its natal Sun is 5.33 arc-seconds lower than the chart's. At the 139 crossings Swiss Mars was within 0.49 arc-seconds of the chart's target. Re-solving the crossings with Swiss Mars shifted them by no more than 0.003 hours against the chart's target, and by up to 0.226 hours against a target taken from Swiss's own natal Sun. Swiss also moved the birthdays by up to 0.179 hours and the sky oppositions by up to 0.126 hours. None of these figures were used to make the page's numbers, and none is an accuracy promise.

Possible themes for Mars to the natal Sun

Treat these as questions, and read them with the natal Sun's sign, its aspects and, if the birth time is reliable, its house:

• Conjunction. Where you might put more energy behind your own aims, and where effort might tip into strain.
• Squares. Effort meeting resistance; often read as a prompt to check how you push.
• Opposition. Your aims set beside another person's, or beside outside demands.
• Trines and sextiles. Often treated as easier moments to act on plans in a steady way.
• Three passes. Some astrologers read a forward, backward and forward contact as one theme visited over a few months.

These are interpretive patterns, not destiny. Nothing on this page predicts or explains events, and none of it claims a Mars transit brings anger, injury, illness, success, or any work, money or relationship result.

For moving Mars against its own natal degree, see the Mars return. Slower movers meeting the same fixed natal Sun are in Jupiter transits to natal Sun and Saturn transits to natal Sun, and Mars moving through the houses rather than contacting a natal point is in Mars transits through the houses.

Doing this for your own chart

1. Take natal Sun from the free birth chart as one longitude counted from 0° Aries. A shown minute is a small range of values.
2. Fix a period first. With a Tropical ephemeris, trace Mars through it without resetting at 0° Aries, loops and all, and place the eight targets (natal Sun plus each angle plus whole laps) along that path.
3. Record each crossing with its direction, and group crossings of one level while Mars stays within 30° of it. Flag any contact still open at either end of the period.
4. For every backward loop, write down where Mars turns backward and where it turns forward. A target between the two gets three crossings; one outside gets one, however near the sky opposition is.
5. Keep sky Sun-Mars oppositions and conjunctions in a separate list. If you want to see where your contacts fall in your own year, measure each crossing's distance from your birthday instead of assuming a pattern.
6. Without a birth time, take natal Sun over the whole birth date and check whether a turning point or the period's start or end lands inside that span for any of the eight angles.

About the repository checks behind the routines: there is no date limit on Mars or the Sun in the free chart. A daily noon comparison of Mars with Swiss over 25 December 1919 to 8 January 2061 found at most 2.22 arc-seconds of difference in the run for this batch, and its 132 turning points matched Swiss within 0.012 hours (limits 0.05°, a tighter 8 arc-seconds, and 0.025 hours). The Sun is checked in 52 stored reference charts within 0.05°. These checks compare positions and turning points, not transit dates, and do not make a projected date a prediction.

A step-by-step method without software is in how to read transits without a transit tool. Ask the Astrologist can discuss your natal Sun, or dates you have worked out; it does not calculate transit dates.

Related articles

• Mars Return
• Jupiter Transits to Natal Sun (different mover, same fixed natal Sun)
• Saturn Transits to Natal Sun (different mover, same fixed natal Sun)
• Retrograde Planets and the Sun (the sky astronomy behind the loops)
• Mars Transits Through the Houses
• Sun Conjunct Mars (natal)
• Sun Opposite Mars (natal)
• What Mars Signs Mean
• Mars Transits to Natal Venus (same mover, a different fixed natal target set apart from the natal Sun)
• Solar Return Date (the moving Sun coming back to the same natal Sun; timing only)