Reconcile one completed lunar illuminated fraction and reported percentage with explicit source, timestamp, reference, precision, and decision boundaries.
Use this result well
Inputs that matter
One de-identified completed source-published, owner-completed or reviewed archive record; responsible record/revision/date/reviewer; exact timestamp and time scale; location or geocentric/topocentric and timezone/DST basis; ephemeris/data-service source, response/version/access evidence, apparent observer reference, illuminated-fraction definition, copied phase label and waxing/waning evidence, primary-phase boundary and precision/rounding record; rise/transit/set, horizon/weather, tide/current station, fishery/habitat/conditions, forecast/decision, regulation/access, field-safety and retention boundaries; copied source fraction; completed report percentage; a user-owned percentage-point tolerance; and an optional same-time comparable independent source plus percentage
Output to expect
Reproduced illumination percentage, completed-report-minus-reproduced signed percentage-point difference, optional independent-minus-reproduced signed difference, and the retained source phase/direction context without a fishing forecast
How it works
Validate every provenance field and the physical fraction/percentage bounds; freeze one exact timestamp, source, observer/reference definition and precision; reproduce percent as the completed source illuminated fraction times 100; compare the completed report inside the user-owned tolerance; require optional independent source and percentage together and compare only when timestamp, reference, definition and precision are comparable; normalize only mathematical zero
Confirm timestamp, time scale, location or geocentric/topocentric reference, source response/version, illumination definition, phase/direction evidence and precision all match. Another timestamp, location, reference, definition, rounding basis or source revision needs another run.
Use the result only for one completed illumination conversion and transcription check. It does not calculate lunar position, phase instants, moonrise, transit, moonset, solunar periods, tide or current; infer local visibility, fish behavior, feeding windows or catch probability; rate or recommend a fishing time; validate the source, time conversion or station; choose species, bait, location, route or trip; establish regulations or access; or authorize travel, boating, wading, fishing, wildlife handling or safety decisions.
Choose your path
Built around the job you need to finish
Reproduce one completed source-owned lunar illuminated fraction as a percentage, then reconcile a completed report and optional comparable same-time source without inventing lunar events, tides, solunar periods, fish behavior or a fishing recommendation.
Astronomy data reviewer checking a copied record
Verify a reported lunar illumination percentage without confusing rounding, observer reference or a phase label.
Freeze the exact timestamp, time scale, source response/version, geocentric or location-specific reference, illuminated-fraction definition, copied phase/direction evidence and precision before reproducing the percent.
Gets transparent conversion and signed report differences while ephemeris accuracy and primary-phase timing remain with the source.
Fishing log archivist preserving context
Store a lunar datum beside a completed outing without claiming that the Moon caused a catch result.
Retain the source lunar record plus separate fishery, species, habitat, weather, water, effort and outcome evidence.
Can audit the copied lunar value while avoiding a universal feeding-window or catch-probability claim.
Trip planner separating astronomy from field decisions
Avoid using one illumination number as a moon-event, tide, access, regulation or safety forecast.
Use current authoritative services for exact lunar events and NOAA station products for tides, then review rules, access and safety for the intended place and activity.
Gets a bounded record check with explicit escalation instead of an unsupported trip recommendation.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Retain one exact timestamp and time scale, the source response and version, geocentric or location-specific observer reference, illuminated-fraction definition, and displayed precision. Another basis needs another record.
Reproduce only the unit conversion
Multiply the copied source illuminated fraction by 100, then compare the completed report and optional same-time independent percentage inside a user-owned rounding tolerance.
A lunar fraction does not supply moonrise, transit, moonset, tide, current, local visibility, fish behavior, catch probability, regulations, access, or field safety. Review those through current sources for the exact place and activity.
Updated: August 2026
Example Scenarios
Confirm that a copied 0.500 fraction and 50.0% report refer to the same timestamp, geocentric definition, source response, and precision.
Retain the source lunar value beside actual place, weather, water, species, effort, and outcome records without assigning lunar causation.
Use authoritative location-specific services for moon events and NOAA station products for tides, then keep regulations, access, and safety decisions separate.
Common Mistakes to Avoid
✕
Deriving phase, moon events, and bite windows from moon age alone
✓
Use a current authoritative astronomy source for the exact timestamp, location, time basis, and requested event. Retain its returned record and definitions.
✕
Treating one lunar percentage as a tide or fishing-success forecast
✓
Use station-specific tide/current products and retain fishery, habitat, weather, effort, regulations, access, and safety evidence separately.
✕
Comparing rounded values from different timestamps or reference definitions
✓
Compare only matching timestamp, observer/reference, illuminated-fraction definition, and precision bases; otherwise create separate records.
FAQ
No. It checks one completed illuminated-fraction conversion and report transcription. It does not produce feeding periods, catch probability, or a fishing rating.
Not by itself. USNO distinguishes First from Last Quarter with increasing versus decreasing illumination, and primary phases are defined by exact geometry at an instant. Copy the same-source phase and direction evidence.
The source definition determines what the number represents. USNO's annual illuminated-fraction service is geocentric, while other location-specific services can include coordinates and local event times.
No. NOAA predictions depend on an exact station, date, time, datum, and product. Select and verify the relevant station outside this Tool.
Yes, when timestamp, observer/reference basis, illumination definition, and precision are comparable. Enter the independent source and percentage together.
About Lunar Illumination Record Check
Audit one completed lunar-data record without turning a rounded moon fraction into a solunar forecast. Copy the exact source fraction, timestamp, observer reference, definition, precision, phase-direction evidence, and completed report percentage.