Annual Aberration Constant 20.49552 Arcsec Lookup
Illustrative conventional annual aberration constant in arcsec, not a date-specific Earth velocity or relativistic correction.
Description
Annual Aberration Constant 20.49552 Arcsec Lookup: look up a supported built-in reference entry.
Annual aberration is an apparent directional shift related to the observer's motion. Its reference constant is not a complete correction vector.
This tool returns a built-in reference entry for an exact supported selector. The supported entries and their scope are part of the tool; no website or current external table is queried.
When to use this tool
Use this tool when the supplied inputs match the specific operation described above and you need a repeatable result under its stated convention.
- Check the supported input and output contract against an existing calculation or observation.
- Use the complete example to confirm units, selector spelling and result interpretation.
How to use the tool and how it works
- Enter every field in the input table using the stated units and the exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
Accept illustrative-constant-arcsec and return 20.49552.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| reference | Reference. | Exact value: "illustrative-constant-arcsec" |
| reference | Built-in entry |
|---|---|
| "illustrative-constant-arcsec" | 20.49552 |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.reference | The stored entry for the exact selected key; its type may be text, a number or a list. |
{
"input": {
"reference": "illustrative-constant-arcsec"
},
"output": {
"result": {
"reference": 20.49552
}
}
}Limitations and assumptions
- The value is the stored illustrative constant; observation geometry and time-dependent aberration are not calculated.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Check the underlying observations, units and conventions independently before using the result in a larger workflow. The tools listed below address nearby tasks; compare their inputs and scope before substituting one for this operation.
References
Similar or alternative tools
- aberration ellipse major axis calculator
Annual aberration traces an ideal ellipse whose shape depends on ecliptic latitude.
- diurnal aberration equator amplitude
Diurnal aberration reflects the observer's rotational velocity relative to light speed.