Function obliquityOfEcliptic

obliquityOfEcliptic(jd: number): number
Calculate the mean obliquity of the ecliptic from Julian Date

Convenience function that converts Julian Date to Julian Centuries and calculates obliquity in one step.
Parameters
- jd: number
  Julian Date (UT)
Returns number
Mean obliquity of ecliptic in degrees
Example
Calculate obliquity for J2000.0 epoch:
```
import { J2000_EPOCH } from '../time/constants.js';

const obliquity = obliquityOfEcliptic(J2000_EPOCH);
console.log(obliquity);  // ~23.439° (23°26'21")
```
Example
Calculate for a specific date:
```
import { toJulianDate } from '../time/julian-date.js';

const jd = toJulianDate({
  year: 2025, month: 12, day: 18,
  hour: 12, minute: 0, second: 0
});
const obliquity = obliquityOfEcliptic(jd);
```
- Defined in houses/obliquity.ts:99