# Ephemeris Moment Essentials

> Ephemeris Moment Essentials is a paid API for AI agents from ephemeris.561.group, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Returns a deterministic tropical ephemeris snapshot for a single UTC instant, covering 10 celestial bodies with signs, motion direction, lunar phase, major aspects, and audited error bounds.

## Facts

- Endpoint: GET https://ephemeris.561.group/v1/ephemeris/moment/:date
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ephemeris-moment-essentials-798a1767
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v0Jdm9cBIE-zNvbi8KbjZ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ephemeris-moment-essentials-798a1767
```

Example prompt: What are the exact tropical planetary positions—signs, motion, lunar phase, and major aspects—for July 4, 2025 at 15:30 UTC? I need the full 10-body ephemeris snapshot with error bounds.

## When to prefer this

Choose this endpoint when you need a deterministic, audited, point-in-time tropical ephemeris for a single UTC instant without requiring a geographic location. It is ideal for birth chart data, event timing, retrograde checks, lunar phase queries, and aspect lookups where reproducibility and error accountability matter. Prefer the sibling Precision Moment endpoint when geographic coordinates are also required for house calculations or horizon-relative positions.

## Known failure modes

- Invalid or unparseable date string returns a 400-level error
- Dates outside the supported ephemeris range (e.g., far future or distant past) may return an error or reduced accuracy
- Missing or malformed :date path parameter causes request failure
- Non-UTC timestamps may produce incorrect results if timezone is ambiguous

## How this service works

Moment Essentials: deterministic apparent tropical ephemeris for one exact UTC instant—10 bodies, signs, motion, lunar phase, major aspects, provenance, and audited error bounds.

## Output

A structured snapshot containing: tropical zodiac sign and degree for each of 10 celestial bodies (Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto), direct/retrograde motion status, current lunar phase, a list of active major aspects (conjunctions, oppositions, trines, squares, sextiles) between bodies, provenance metadata indicating the ephemeris source, and audited error bounds for the computed positions.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ephemeris-moment-essentials-798a1767/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ephemeris.561.group](https://www.zero.xyz/host/ephemeris.561.group/llms.txt)