Celestial Equator Altitude By Latitude
Uppermeridianaltitudecelestialequatordec0=90−|latitude|,not wholeequatorgreatcircle fixedaltitude. Actual independent model/unit/frame/epoch/calibration and applicable measurement established;not precise ephemeris,forecast,geodesy operation,identity or safety approval.
Description
The celestial equator’s upper meridian intersection has an altitude determined by observer latitude.
The celestial equator’s upper meridian intersection has an altitude determined by observer latitude.1
This calculator gives that particular altitude, rather than assigning one altitude to the entire equatorial great circle.
When to use Celestial Equator Altitude By Latitude
Use this tool to apply the stated celestial equator altitude by latitude operation with an explicit input and unit basis.
How to use Celestial Equator Altitude By Latitude and how it works
- Establish the measurement basis and units described above.
- Enter actualLatitudeDegrees and run the tool.
- Read result.value using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualLatitudeDegrees | Latitude Degrees. Units, ordering and applicable branch are specified in the algorithm. | number | required; finite; further conditions in the algorithm |
Require latitude within ±90 degrees inclusive. Return 90 minus its absolute value, giving zero at a pole and 90 at the equator.
equatorUpperMeridianAltitude = 90−abs(latitude) Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.value | Celestial-equator upper meridian altitude in degrees. | number |
{
"input": {
"actualLatitudeDegrees": 30
},
"output": {
"result": {
"value": 60
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A returned boolean, signed difference or tied result follows the stated convention; an input error instead means the required input contract was not satisfied. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Maximum Transit Altitude Calculator. A star’s upper meridian transit is its highest altitude during an ideal diurnal circle.
For a related operation, use Circumpolar Declination Threshold By Latitude. Circumpolar geometry describes declinations that remain on the visible side of an ideal horizon during rotation.
References
-
Celestial Equator Altitude By Latitude — tool.io
Similar or alternative tools
- Maximum Transit Altitude Calculator
A star’s upper meridian transit is its highest altitude during an ideal diurnal circle.
- Circumpolar Declination Threshold By Latitude
Circumpolar geometry describes declinations that remain on the visible side of an ideal horizon during rotation.