Supermoon Size Increase Percent Check
Actual angular diameter increase vs independently defined reference and caller screen; diameter not area, no universal supermoon designation. Model only, not an ephemeris, measured stellar identity or observational guarantee.
Description
An apparent lunar size increase requires an explicit comparison observation.
An apparent lunar size increase requires an explicit comparison observation.1
Diameter percentage and brightness percentage are different measures. Use Supermoon Size Increase Percent Check to evaluate the supplied inputs under the model explained below.
When to use Supermoon Size Increase Percent Check
Use Supermoon Size Increase Percent Check to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.
How to use Supermoon Size Increase Percent Check and understand its results
- Establish the units, measurement scope and model assumptions before entering values.
- Enter Observed lunar angular diameter arcmin, Caller comparison angular diameter arcmin, Caller increase review percent using the field table and validation rules below, then run the tool.
- Read Observed diameter increase percent, Caller diameter threshold reached; interpret the units, signs, ordering and unknown-value placeholders described below.
- Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedLunarAngularDiameterArcmin | Observed lunar angular diameter arcmin | number | Required; constraints below |
| callerComparisonAngularDiameterArcmin | Caller comparison angular diameter arcmin | number | Required; constraints below |
| callerIncreaseReviewPercent | Caller increase review percent | number | Required; constraints below |
Enter positive observed and comparison angular diameters in arcmin and a nonnegative review threshold in percent. Compute 100×(observed/comparison−1) and compare inclusively with the threshold. A smaller observed diameter yields a negative change. No orbital position, standard supermoon definition or brightness change is inferred.
increasePercent=100×(observedDiameter/referenceDiameter−1); reached=increase≥threshold Use the field order, units and branch conditions described above.
| Output field | Meaning | Value type |
|---|---|---|
| observedDiameterIncreasePercent | Observed diameter increase percent | number |
| callerDiameterThresholdReached | Caller diameter threshold reached | boolean |
{
"input": {
"observedLunarAngularDiameterArcmin": 34,
"callerComparisonAngularDiameterArcmin": 30,
"callerIncreaseReviewPercent": 10
},
"output": {
"observedDiameterIncreasePercent": 13.33333333333333,
"callerDiameterThresholdReached": true
}
}Limitations and assumptions
Diameter percentage and brightness percentage are different measures. Apply the exact scope and assumptions explained above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.
Alternative or Complementary methods
Use Lunar Phase Illumination Percent for a related task: Lunar elongation and illuminated fraction are connected under distant-Sun geometry.
Use Opposition Brightness Enhancement Factor for a related task: An opposition brightness comparison needs fluxes in the same band and measurement scope.
References
-
Supermoon Size Increase Percent Check — tool.io
Similar or alternative tools
- Lunar Phase Illumination Percent
Lunar elongation and illuminated fraction are connected under distant-Sun geometry.
- Opposition Brightness Enhancement Factor
An opposition brightness comparison needs fluxes in the same band and measurement scope.