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Asteroid goddesses calculator - Ceres, Pallas, Juno, and Vesta natal positions

post_astrology_asteroids

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Calculate natal positions of Ceres, Pallas, Juno, and Vesta for any birth moment to get zodiac sign, house, daily speed, retrograde status, and chart interpretation.

Instructions

Calculate the natal positions of the four classical asteroid goddesses, Ceres, Pallas, Juno, and Vesta, for any birth moment. Each asteroid returns its tropical zodiac sign, degree, house placement, daily speed, retrograde status, and a plain language interpretation of its meaning in the chart. Chiron is available through the natal chart endpoint, so this endpoint stays focused on the four asteroid goddesses for natal reports and relationship astrology.

Input Schema

Name	Required	Description	Default
`date`	Yes	Birth date in YYYY-MM-DD format. Determines planetary positions for the specific calendar day.
`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
`time`	Yes	Birth time in 24-hour HH:MM:SS format. Determines the Ascendant (rising sign) and house cusps. Use 12:00:00 if unknown.
`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.
`latitude`	Yes	Birth location latitude in decimal degrees (-90 to 90). Positive = North, negative = South.
`nodeType`	No	Lunar node convention. "mean" is the smoothed average node, which always moves retrograde; "true" is the osculating node, which tracks the real perturbed node, oscillates up to about 1.5 degrees either side of the mean on a 173-day cycle, and can briefly turn direct. Neither is more correct and they almost always fall in the same sign. Applies to the North and South Node. True is the osculating node and the default, because it is what most Western chart software reports; mean is the smoothed node preferred by several evolutionary schools, so pass "mean" to match one. Nothing else in the chart changes, and the two agree on the sign except when the node sits within about 1.8 degrees of a cusp. Defaults to "true".	true
`timezone`	Yes	Timezone: an IANA name (e.g. "America/New_York", "Europe/London", or `cities[0].timezone` from /location/search) or decimal hours from UTC (e.g. -5 for EST, 5.5 for IST). An IANA name is resolved to the offset in force at the given date and time.
`longitude`	Yes	Birth location longitude in decimal degrees (-180 to 180). Positive = East, negative = West.
`houseSystem`	No	House system used to assign each asteroid to a natal house. Placidus (default), Whole Sign, Equal, or Koch. Above the polar circle, quadrant systems fall back to Whole Sign and the echoed houseSystem reports the system actually used.	placidus

Output Schema

Name	Required	Description	Default
`summary`	Yes
`asteroids`	Yes
`houseSystem`	Yes
`birthDetails`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv1.1.2Oct 5, 2026

changedInput schema / examples

Previous value: -[
-  {
-    "date": "1990-07-15",
-    "latitude": 40.7128,
-    "longitude": -74.006,
-    "time": "14:30:00",
-    "timezone": -5
-  }
-]New value: +[
+  {
+    "date": "1990-07-15",
+    "latitude": 40.7128,
+    "longitude": -74.006,
+    "time": "14:30:00",
+    "timezone": "America/New_York"
+  }
+]

changedInput schema / properties / timezone / example

Previous value: --5New value: +"America/New_York"

First observedv0.1.0Oct 4, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that: it enumerates what each asteroid returns (sign, degree, house, daily speed, retrograde status, interpretation) and clarifies the deliberate scope exclusion of Chiron. It does not discuss rate limits or computation cost, but the added scope and output detail is substantive.

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?

Three sentences, front-loaded with the core purpose and scope, followed by output detail and the Chiron routing note. Every sentence carries information; the middle sentence is slightly list-heavy but earns its place by preempting questions about what comes back.

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?

With an output schema present and 100% parameter coverage, the description need not explain return shapes or field syntax, and it correctly focuses on scope and routing. It is complete for selection purposes; only minor gaps remain around polar-latitude fallback behavior and precision limits, which the schema partially covers.

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 description coverage is 100% across all 9 parameters, with detailed per-field docs for date, time, timezone, houseSystem, nodeType, lang, and compact. The description adds no parameter-level guidance of its own, so the baseline 3 is appropriate — the schema carries the full parameter burden.

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 opens with a specific verb+resource ('Calculate the natal positions of the four classical asteroid goddesses, Ceres, Pallas, Juno, and Vesta'), names the exact bodies covered, and explicitly distinguishes itself from the natal chart endpoint by stating Chiron is handled there. An agent can separate this from post_astrology_natal_chart or post_astrology_lilith without inspecting schemas.

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 states the use context ('for natal reports and relationship astrology') and routes Chiron work to the natal chart endpoint, giving a clear when-to-use signal and one explicit alternative. It stops short of naming when this tool should NOT be used versus other asteroid-adjacent endpoints (e.g. Lilith, Arabic lots), so it is clear but not exhaustive.

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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