Function getSunriseSunset

getSunriseSunset(
ahargana: number,
latitude: number,
): { dayLengthHours: number; sunrise: number; sunset: number }
Calculate topocentric Sunrise and Sunset.

[Ch. II, v.60-63] Calculates the horizon transitions based on topocentric altitude and the Sun's position.
Parameters
- ahargana: number
- latitude: number
Returns { dayLengthHours: number; sunrise: number; sunset: number }