Western Astrology MCP Server by RoxyAPI

Ecliptic Crossings - Node passages for a whole year

post_astrology_ecliptic_crossings

Read-only

Get every moment a body crosses the plane of the ecliptic during a given year, for the 11 Western bodies that leave it: the Moon and Mercury through Pluto, plus Chiron and Black Moon Lilith. A crossing from south to north is an ascending node passage, north to south a descending one. These are the instants a body sits exactly on the ecliptic rather than merely near it, which is what makes an eclipse possible when a lunar crossing coincides with a New or Full Moon, and what practitioners use for node-based timing. Returns the exact date and time in your timezone with the tropical longitude and sign. The Sun and the lunar nodes are excluded because they lie on the plane by definition and so have no nodes of their own. Essential for eclipse-season work, node timing, and astronomical calendars. Ecliptic crossing API, planetary node passage, ascending and descending nodes. Verified against NASA JPL Horizons.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`lang`	No	Response language (BCP 47). Supported: en, tr, de, es, hi, pt, fr, ru, zh-Hans, zh-Hant. Defaults to en. Coverage varies by domain, and a field with no translation in the requested language returns English.	en
`year`	Yes	Year to scan for node passages (1900-2100).
`compact`	No	Set true for the same data in a compact shape: arrays of same-shaped objects arrive columnar as {"__cols":[names],"__rows":[[values]]}. Lossless, typically 40 to 52 percent fewer tokens.
`timezone`	No	Timezone offset from UTC in hours. Crossing dates and times are reported in this zone. Defaults to 0 (UTC).

TDQS

A4.1/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations indicate read-only/non-destructive behavior, and the description adds meaningful behavior: the Sun and lunar nodes are excluded, crossings are exact positions rather than near approaches, and data is validated against NASA JPL Horizons. It also explains the eclipse-relevant consequence of lunar node coincidences.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The body opening smoothly states the scope and use-case, followed by important clarifications. The final keyword phrase, 'Ecliptic crossing API, planetary node passage, ascending and descending nodes,' is largely redundant SEO filler repeating the topic and the body scope, preventing a perfect score.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Even without an output schema, the description specifies what will be returned—exact date/time, timezone, tropical longitude, and sign—and explains the body set. Combined with the full input schema and use-case guidance, this is sufficient for an agent to select and invoke the tool correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema covers 100% of parameters with descriptions, examples, ranges, defaults, and enum values. The description only reiterates general timezone and return-value ideas without adding semantic nuance; the schema already carries parameter documentation.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states the exact operation: it captures every moment a body crosses the ecliptic during a year, names the bodies involved, and defines ascending vs. descending node passages. This clearly differentiates the tool from all astrology siblings, especially node-related queries.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives explicit usage context: 'essential for eclipse-season work, node-based timing, and astronomical calendars.' It does not explicitly list exclusions or alternatives, and there are no close sibling-tools for this specific calculation, so the guidance is clear enough.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

A3.8/5.0

Disambiguation3/5

Most tools are scoped to a clearly distinct domain—moon phases, houses, returns, fixed stars, astrocartography—but several pairs overlap, notably synastry vs. compatibility_score and transits vs. transit_aspects. The descriptions are long and do help an agent choose, but the boundaries are not always obvious at the name level.

Naming Consistency4/5

Every tool follows the same snake_case get_astrology_/post_astrology_ prefix pattern, making the group predictable and readable. However, collection endpoints like get_astrology_planet_meanings_id and get_astrology_signs_id awkwardly combine plural collection and singular id naming, and names like calendar_year_month depart from the cleaner resource+suffix pattern.

Tool Count2/5

With 38 tools, this is well over the 25+ threshold and feels heavy for an agent to traverse. While Western astrology is a broad domain, several near-duplicate endpoints, especially synastry/compatibility and transits/transit_aspects, could be consolidated into fewer, more scoped tools.

Completeness5/5

The toolset is comprehensive, covering natal charts, relationships, transits, returns, progressions, aspects, houses, relocation, and reference data. It includes enough specialized endpoints for both casual horoscope use and in-depth astrological analysis, with no obvious dead ends for the stated domain.

Resources

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