Keep the two moments visible
Return-to-return aspects compare two bodies at the solved return instant. Return-to-natal contacts compare a return body with a body at the recorded birth instant. Astrodienst supplies separate tables for these comparisons; Brian Clark’s worksheet also separates their roles. A label such as “Venus opposite Saturn” is incomplete until both chart identities are known.
In the Atlas tool, the left position belongs to the return chart and the right position to the natal chart. Each keeps its own whole-sign house. Both use the selected zodiac reference. The same planet name may legitimately appear on both sides because the observations come from different moments.
Astrodienst · separate return and natal aspect tables ↗Brian Clark · Solar Return Worksheet II, printed p. 20 ↗
Choose a contact and inspect its actual orb
Select a return planet, then choose one of its conjunctions or oppositions to natal planets. The orb control is an explicit display convention, defaulting to 3°. Sorting by distance from exactness makes the list easier to inspect; it is not a prediction-strength score. Other aspect angles remain outside this particular list.
The tool calculates the shortest longitude separation without rounding first. A conjunction is measured from 0°, an opposition from 180°. For example, 359° and 1° are 2° apart, while 10° and 190.5° have a 179.5° separation and a 0.5° opposition orb. The two-chart display shows both separation and orb so their meanings stay distinct. Zero orb accepts only exact numerical equality; a solver’s tiny residual may therefore exclude the defining match.
Recognize geometry built into the return
The returning luminary matches its natal longitude by definition. Its self-conjunction is therefore labelled “Defines the return.” Contacts from that same return luminary to other natal planets repeat its natal geometry; Clark explicitly notes this repetition for the solar-return Sun.
A third dependency follows from the same equality: another return body contacting the natal returning luminary duplicates its contact with the return luminary, within the numerical residual. Atlas keeps all these rows inspectable with distinct labels. Counting them again does not create independent corroboration. Other rows are ordinary cross-chart comparisons, not a claim of statistical independence.
Astrodienst · separate return and natal aspect tables ↗Brian Clark · Solar Return Worksheet II, printed p. 20 ↗Astral Atlas · return-to-natal contact controls ↗
Read the functions and houses before adding a judgement
In Deborah Houlding’s traditional account, conjunction combines the planets’ meanings; opposition emphasizes division or conflict. The participating planets and their condition modify the interpretation. Neither angle alone supplies a fixed favorable or unfavorable outcome.
Atlas uses original study wording to connect the displayed return and natal house topics. Synthetic example: return Venus in return house three opposite natal Saturn in natal house nine at 0.8° orb may frame a question about everyday communication and established beliefs. The house placements must actually be present in the chosen charts. A missing condition is not labelled weak, afflicted or neutral.
Preserve the zodiac and the interpretive school
A sidereal comparison uses the named ayanamsha at each chart’s own epoch. Do not mix a tropical natal longitude with a sidereal return longitude or substitute one fixed offset for the selected two-epoch calculation. The houses in this tool are explicitly whole-sign houses, irrespective of another workspace’s house setting.
A degree comparison in Lahiri or another sidereal frame does not implement Tajika aspect strengths or its configurations. Gansten’s discussion describes additional roles for dignity, application and separation, motion and speed. A fixed natal point is not another planet moving simultaneously. This panel therefore supplies geometric contacts and clearly scoped study wording, rather than claiming those traditional procedures.
Swiss Ephemeris · sidereal coordinate conventions ↗Martin Gansten · Introduction, §4.3, The Sixteen Configurations ↗
Carry the comparison into a reproducible reading
Calculate a return, select its planet and adjust the contact orb. Pick a row to see its positions, two house frames, dependency label and explanation together. The chart download retains the selected contact, the complete filtered row set, both timestamps, the orb and the exact reading snapshot.
No matching natal chart means no natal contacts. An empty filtered list means no conjunction or opposition within the selected orb for that return planet. Try another body or orb when useful; neither state is a verdict about the whole cycle.
Historical clocks need an explicit time scale
UTC, UT1 and Terrestrial Time are different quantities. Swiss Ephemeris treats supplied calendar clocks before 1972 as UT1; from 1972 its normal input convention is UTC. A Z suffix in an exported historical timestamp is therefore a storage representation, not proof of modern leap-second UTC. Keep the Julian day and the declared clock convention beside a historical chart.
Our 1950 diagnostic illustrates why this matters. Reading the same clock label as Skyfield’s extended UTC or as UT1 changes the natal physical instant by about 13.17 seconds, and the later return can differ by 11–13 seconds. Using UT1 consistently in both implementations restores agreement within the predeclared 2-second criterion. This checks a declared numerical convention; it does not resolve uncertainty in an old birth record.
Swiss Ephemeris · UTC and Julian days, §9.3 ↗Skyfield · time scales ↗Astral Atlas · independent return-time comparison data ↗
What the independent return-time checks establish
Atlas compared its Swiss Ephemeris search with an independently written Skyfield/JPL DE421 bracket-and-bisection calculation. Thirty synthetic cases cover first and subsequent Sun/Moon returns and ten no-crossing windows. Twenty root comparisons differ by no more than 0.086 seconds, within a 2-second criterion chosen before seeing the results. The equinox example exercises a target near 359.9997 degrees.
The two implementations measure apparent geocentric longitude in the ecliptic frame of each observation date. Separate tests place search endpoints five seconds before and after the independent root; exact millisecond endpoint inclusion is checked separately against the product’s own root. This distinction prevents internal consistency from being advertised as independent timing evidence.
These are sampled tropical comparisons, including one historical UT1 example. They do not certify every supported year, any sidereal return convention, house calculations or a prediction. Both ephemerides have JPL ancestry; implementation independence is not independence from every underlying astronomical model. Download the comparison records to inspect the inputs, time scales, differences, kernel identity and exclusions.
Skyfield · ecliptic coordinates ↗Astral Atlas · independent return-time comparison data ↗
Word origin · etymology
Descriptive English technique name.
Return names a body's coming back to a specified reference position; chart names the diagram cast for that event.
How we know · epistemology
Calculated crossing with symbolic use
The returning body's longitude match defines the chart. The selected cycle and location complete its setup; interpreting that chart as a period's themes is a further practitioner convention. Its defining luminary conjunction recurs by construction; repeated geometry is not independent predictive evidence.
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Connected concepts
Read alongside this entry
Terms used in this explanation
Mentioned in 3 other entries
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.
Find these sources across the wiki →
- AstroGraph: TimePassages Desktop Manual, chapter11 ↗
- Astrodienst · separate return and natal aspect tables ↗
- Brian Clark · Solar Return Worksheet II, printed p. 20 ↗
- Merriam-Webster: return ↗
- Astral Atlas · return-to-natal contact controls ↗
- Deborah Houlding · Classical Origins of Aspects ↗
- Swiss Ephemeris · sidereal coordinate conventions ↗
- Martin Gansten · Introduction, §4.3, The Sixteen Configurations ↗
- Swiss Ephemeris · UTC and Julian days, §9.3 ↗
- Skyfield · time scales ↗
- Astral Atlas · independent return-time comparison data ↗
- Skyfield · ecliptic coordinates ↗