{"success":true,"project":"Astro Sindhi Observatory","engine":"SolarPositionEngine","version":"1.0.0","status":"production-research-api","timezone_standard":"Asia/Karachi","freshness":{"requested_date":"2026-03-20","calculated_for":"2026-03-20","valid_date":"2026-03-20","generated_at":"2026-10-15T00:00:00+00:00","valid_from":"2026-03-20T00:00:00+00:00","valid_until":"2026-03-21T00:00:00+00:00","expires_at":"2026-03-21T00:00:00+00:00","timezone":"UTC","is_live":false,"is_stale":false,"cache_bucket":"2026-03-20"},"data":{"project":"Astro Sindhi Observatory","engine":"SolarPositionEngine","version":"1.0.0","input":{"datetime":"2026-03-20T10:00:00+00:00","timezone":"UTC","latitude":25.396,"longitude":68.3578},"result":{"utc":"2026-03-20T10:00:00Z","asia_karachi":"2026-03-20T15:00:00+05:00","julian_day_utc":2461119.91666667,"jde_tt":2461119.91753707,"delta_t_seconds_estimate":75.202,"mean_longitude_degrees":357.95867504,"mean_anomaly_degrees":74.57052146,"eccentricity_earth_orbit":0.016697605421,"equation_of_center_degrees":1.85442063,"true_longitude_degrees":359.81309567,"apparent_longitude_degrees":359.80919535,"right_ascension_degrees":359.82493868,"right_ascension_hours":23.98832925,"declination_degrees":-0.07589445,"mean_obliquity_degrees":23.43588211,"true_obliquity_degrees":23.4382559,"equation_of_time_minutes":-7.457397,"earth_sun_distance_au":0.9958193479,"apparent_diameter_degrees":0.53536618,"apparent_diameter_arcminutes":32.12197,"local_sidereal_time_degrees":36.30983992,"hour_angle_degrees":36.48490124,"solar_altitude_degrees":46.53120775,"solar_azimuth_degrees":239.80404909,"observer_latitude_degrees":25.396,"observer_longitude_degrees":68.3578,"equinox_check_note":"Vernal equinox occurs when apparent solar longitude is near 0°/360°."},"status":{"calculation_status":"production_solar_position_engine","historical_status":"historical_validation_ongoing","scientific_validation":"ongoing","precision_note":"Solar position values are generated through the Observatory computation framework. Scientific validation and reference comparison remain ongoing."},"assumptions":{"calendar":"Gregorian date/time input; proleptic Gregorian handling for historical dates in this production research engine.","timezone_default":"UTC","time_scale":"UTC input converted to approximate Terrestrial Time using ΔT estimate."}},"meta":{"api_schema":"1.1","api_status":"production-research-api","scientific_validation":"ongoing","request_id":"276657383a9d5143","freshness":{"requested_date":"2026-03-20","calculated_for":"2026-03-20","valid_date":"2026-03-20","generated_at":"2026-10-15T00:00:00+00:00","valid_from":"2026-03-20T00:00:00+00:00","valid_until":"2026-03-21T00:00:00+00:00","expires_at":"2026-03-21T00:00:00+00:00","timezone":"UTC","is_live":false,"is_stale":false,"cache_bucket":"2026-03-20"},"attribution":{"source":"Astro Sindhi Observatory","website":"https://astro.sindhilanguage.org","developer_portal":"https://astro.sindhilanguage.org/api/","organization":"SindhiLanguage.org","organization_url":"https://sindhilanguage.org","data_license":"CC BY 4.0","software_license":"All Rights Reserved unless otherwise stated"},"calculation_model":"Meeus-style low-precision solar formulae"}}