New & Full Moons: a guide to lunation transits

The short answer

A lunation is a complete Sun–Moon phase cycle in astronomical usage. Astrological writing also uses the term for a New or Full Moon event; a lunation transit reading compares that selected event with a natal chart.

What is a lunation transit?

A New Moon identifies the conjunction of the Sun and Moon in geocentric ecliptic longitude; a Full Moon identifies their opposition. These are relationships within the moving sky. A natal contact is an additional comparison with a position recorded in a birth chart.

For this guide, a lunation reading means that event-to-natal comparison. Rudhyar’s archived 1951 article A New Type of Lunation Guidance describes this established approach before proposing his own different method. We use the comparison as a reading framework, without adopting his predictive or biological claims.

If you need the phase names or the distinction between exact events and extended phase sectors, begin with the Moon-phase guide. That page owns the cycle vocabulary; this one shows how to organise a transit reading.

What is different about a New Moon and a Full Moon reading?

At New Moon, the Sun and Moon occupy the same longitude. At Full Moon, they occupy opposite longitudes, so keep both ends of that axis in the note. An article headed “Full Moon in Scorpio” names the Moon’s sign; the Sun is on the other side of the zodiac.

CHANI uses beginnings and culmination as contemporary symbolic themes for New and Full Moons. You can turn those themes into questions about starting, noticing or reviewing a project. They are not deadlines imposed by the sky, evidence of an approaching crisis or a promise that an intention will produce a result.

The angle definition and the interpretation play different roles. A correct event time does not by itself validate the story attached to it.

Start with one event and a stated method

Record the event source, timestamp and timezone. A single instant can fall on different calendar dates in different timezones. Check that the supplied positions are for the exact event rather than a daily snapshot, and use matching coordinate and zodiac settings when comparing them with the natal chart.

For natal houses, retain the birth information and chosen house system. An unknown or approximate birth time can leave house boundaries and angles uncertain. An event chart’s own houses are a different reference from the person’s natal houses; do not silently switch between them.

This article contains invented coordinates for learning. It does not calculate the next lunation, supply current degrees or generate a personal event chart.

A Full Moon and two natal square comparisons

Keep three invented longitudes in view: transiting Sun at 18° Taurus = 48°, transiting Moon at 18° Scorpio = 228°, and natal Venus at 20° Leo = 140°. The Sun and Moon differ by 180°, so the moving pair forms a Full Moon alignment in longitude.

Now compare each moving point with the fixed natal one. Sun to Venus gives 92°; Moon to Venus gives 88°. Each is 2° from the 90° target of a square. A hypothetical inclusive 3° allowance accepts both; a 1° allowance accepts neither. The coordinates did not change—the declared selection rule did.

This model says nothing about applying or separating motion, because one snapshot does not supply the time sequence needed for that classification. The transit-aspect guide explains those additional checks.

Which natal houses does the lunation occupy?

Add one explicit assumption to the same invented example: Libra rising with Whole Sign houses. Libra is house one; Taurus is house eight; Scorpio is house two. The Sun and Moon therefore occupy the eighth and second natal houses in this chosen model.

This is a sign-counting exercise, not a calculated Ascendant. Keep the house result separate from the 92° and 88° aspect comparisons. A house label locates a position in a framework; an aspect compares two longitudes. One does not replace the other.

If you change the house method, recalculate the boundaries before carrying the house labels across. If the rising sign is not supported, omit this step and retain only comparisons whose inputs are known. CHANI’s daily-practice article is one contemporary example that distinguishes rising-sign house readings from more specific natal-degree contacts.

How long does a lunation transit last?

The exact Sun–Moon event is an instant. A surrounding interval selected for interpretation is a separate convention. State whether your note concerns the event itself, a chosen orb around a natal contact, or a broader phase sector.

Do not turn a single angular allowance into an assumed number of days. For a real interval, follow the changing positions and calculate when the stated condition begins and ends. The Sun and Moon have different paths and rates, so their contacts with the same natal point need not have the same timing.

A Full Moon is not automatically an eclipse. The additional node alignment is explained in the phase guide. Neither an eclipse label nor a close aspect establishes a personal outcome.

Build a useful lunation reading note

1. Event: name New or Full Moon, the source and exact timestamp.
2. Sky positions: record both longitudes with the coordinate convention.
3. Natal reference: record the selected fixed points and any uncertainty.
4. Comparisons: list the smaller angles, target aspects and chosen allowances. Include excluded contacts.
5. Houses: add these only when the birth information and method support them.
6. Reflection: choose one practical question, then record what happened separately.

Using the invented Full Moon, a note might read: “Both luminaries are within my declared 3° allowance of a square to natal Venus. In this Whole Sign exercise, the axis crosses houses two and eight. What agreement or shared responsibility would benefit from a clearer conversation?” The final question is our reflective prompt, not a predicted event or a required interpretation.

A question to take with you

What becomes clearer when your note separates the event in the sky, the comparison with your chart and the real-life question you want to explore?