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Retrograde Planets Tracker

Check which classical planets are direct, retrograde, or near-stationary at a documented instant using offline apparent geocentric longitude motion.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter the local date.
  2. 2.Enter the local clock time.
  3. 3.Enter the documented UTC offset.
  4. 4.Check status to see each planet's motion label, tropical sector, and longitude.

About Retrograde Planets Tracker

Retrograde Planets Tracker keeps the entire calculation inside the visitor's browser. It classifies Mercury through Pluto by whether apparent geocentric ecliptic longitude decreases, increases, or barely moves over a short probe. The workflow starts from a documented local date, clock time, and explicit UTC or UTC-equivalent offset, converts those fields into one proleptic UTC-like instant, and then runs the pinned Astronomy Engine 2.1.19 adapter without uploading anything or opening a runtime network socket.

Geocentric means the observer origin is the center of Earth. Geographic latitude, longitude, elevation, GPS, or IP-based location are therefore not inputs to this longitude. The calculator also refuses to invent an Ascendant, house cusps, aspects, midpoints, or a topocentric sky position, because those products need a place and a different geometric contract.

A wall-clock time still does not identify one instant without the documented numeric offset for that place and date. The form therefore requires an explicit signed offset from -12:00 through +14:00, including non-whole-hour values, and it rejects impossible Gregorian dates, impossible clocks, malformed offsets, and normalized instants outside the supported UTC years 1700 through 2100.

Before modern standard time zones, local mean time may not map cleanly onto a present-day UTC offset. Early-date results must be read as proleptic UTC-like estimates based on the convention the visitor typed. Lizely never silently reconstructs historical political zone databases or daylight-saving transitions.

The ephemeris contract is apparent Earth-center true ecliptic of date. Expected comparison values in the evidence package were authored from NASA JPL Horizons observer quantity 31 and independently from IMCCE Miriade using the INPOP theory. Astronomy Engine is only the offline implementation under test, never the expected-data source. Circular differences larger than five thousandths of a degree fail the dual-official gate.

Tropical display labels divide three hundred sixty degrees into twelve equal half-open thirty-degree sectors beginning with Aries at zero. Those names are a Western tropical cultural convention, not IAU constellation outlines. Near a sector boundary, a tiny change in time, offset, or ephemeris can change the printed label, so the sign calculator warns inside five hundredths of a degree of an edge.

Related Lizely fortune tools reuse the same narrow geocentric adapter for Mercury, Venus, Mars, Jupiter, and Saturn so visitors can compare classical planets without mixing house systems. Guide candidates may later explain the mathematics, but procedural tool-name keywords stay out of the automatic article queue until a separate coverage milestone activates them.

Quality gates for this release include isolated golden-case tests, widget disclosure checks that forbid live fetch and geolocation, production-mode page delivery, offline recalculation after the local server stops where applicable, unchanged article counts during production sync, and IndexNow submission after deployment. The experience remains entertainment and cultural astronomy, not medical, legal, financial, safety, employment, or relationship advice. Operators should treat every published number as an estimate bounded by the dual-official tolerance, disclose the entertainment framing next to the result, and keep Guide keyword activation as a later controlled milestone rather than an automatic side effect of shipping the calculator itself. The same discipline applies when comparing neighboring planet tools: reuse the shared adapter, keep evidence authored from external oracles, and never silent-fail a boundary or antipode case.

Methodology & sources

For each tracked body, compute apparent geocentric ecliptic longitude at the instant and twelve hours later. Negative signed delta ⇒ retrograde; positive ⇒ direct; |delta| below 0.002° ⇒ stationary.

Frequently asked questions

Which bodies are tracked?
Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The Sun and Moon are excluded.
How is retrograde defined here?
Apparent geocentric ecliptic longitude decreasing over a twelve-hour probe. Near-zero absolute change is labelled stationary.
Does this forecast luck or personality?
No. It is an offline astronomy status table for entertainment and cultural interest only.

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