{"assessment":{"best_window":null,"cost":{"altitude":0.0,"clouds":11.75,"darkness":2.67,"moon":0.0},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":"Overcast (\u226580 % cloud) for 13.3 of 13.3 dark hours \u2014 the sky is closed whatever the geometry says.","headline":"Not tonight","hourly":[{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T15:00Z","label":"unusable","low":35,"mid":22,"moon_alt":-15,"precip":0.0,"q":0.0,"rh":90,"sky":"civil twilight","temp":6.5,"time":"17:00","wind":13.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T16:00Z","label":"unusable","low":16,"mid":82,"moon_alt":-26,"precip":0.0,"q":0.0,"rh":89,"sky":"nautical twilight","temp":6.0,"time":"18:00","wind":15.1},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T17:00Z","label":"unusable","low":80,"mid":100,"moon_alt":-37,"precip":0.1,"q":0.0,"rh":91,"sky":"night","temp":6.1,"time":"19:00","wind":15.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T18:00Z","label":"unusable","low":100,"mid":92,"moon_alt":-47,"precip":0.6,"q":0.0,"rh":96,"sky":"night","temp":6.6,"time":"20:00","wind":18.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T19:00Z","label":"unusable","low":99,"mid":20,"moon_alt":-57,"precip":0.1,"q":0.0,"rh":95,"sky":"night","temp":7.4,"time":"21:00","wind":19.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T20:00Z","label":"unusable","low":93,"mid":97,"moon_alt":-65,"precip":0.2,"q":0.0,"rh":94,"sky":"night","temp":7.5,"time":"22:00","wind":22.8},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T21:00Z","label":"unusable","low":27,"mid":100,"moon_alt":-68,"precip":0.7,"q":0.0,"rh":96,"sky":"night","temp":6.8,"time":"23:00","wind":23.8},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T22:00Z","label":"unusable","low":47,"mid":94,"moon_alt":-65,"precip":1.3,"q":0.0,"rh":97,"sky":"night","temp":6.5,"time":"00:00","wind":24.7},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-18T23:00Z","label":"unusable","low":35,"mid":100,"moon_alt":-57,"precip":2.0,"q":0.0,"rh":95,"sky":"night","temp":6.2,"time":"01:00","wind":24.7},{"alt":null,"cloud":100,"high":98,"iso":"2025-11-19T00:00Z","label":"unusable","low":23,"mid":100,"moon_alt":-48,"precip":1.9,"q":0.0,"rh":94,"sky":"night","temp":6.1,"time":"02:00","wind":24.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-19T01:00Z","label":"unusable","low":10,"mid":97,"moon_alt":-37,"precip":0.8,"q":0.0,"rh":87,"sky":"night","temp":6.5,"time":"03:00","wind":25.2},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-19T02:00Z","label":"unusable","low":11,"mid":91,"moon_alt":-27,"precip":0.6,"q":0.0,"rh":95,"sky":"night","temp":5.7,"time":"04:00","wind":18.9},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-19T03:00Z","label":"unusable","low":18,"mid":89,"moon_alt":-16,"precip":0.6,"q":0.0,"rh":96,"sky":"night","temp":5.7,"time":"05:00","wind":17.1},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-19T04:00Z","label":"unusable","low":15,"mid":98,"moon_alt":-6,"precip":1.0,"q":0.0,"rh":96,"sky":"astronomical twilight","temp":6.0,"time":"06:00","wind":17.6},{"alt":null,"cloud":100,"high":100,"iso":"2025-11-19T05:00Z","label":"unusable","low":8,"mid":97,"moon_alt":4,"precip":0.5,"q":0.0,"rh":95,"sky":"civil twilight","temp":5.5,"time":"07:00","wind":15.1}],"peak_quality":0.0,"peak_sky":1.0,"quality_hours":0.0,"reasons":["cloud cover cost 11.7 quality-hours","daylight and twilight cost 2.7 quality-hours"],"reference_hours":4.0,"score":0,"score_astronomy":100,"score_weather":0,"sky_hours":11.75,"verdict":"unusable","verdict_astronomy":"good","weather_known":true,"windows":[{"end":"2025-11-19T05:20Z","end_local":"07:20","hours":14.42,"label":"unusable","mean_quality":0.0,"start":"2025-11-18T14:55Z","start_local":"16:55"}]},"calculation_version":"2026-10-10.1","forecast":[{"cloud":100,"dark":false,"high":100,"local":"16:00","low":83,"mid":31,"precip":0.0,"rh":88,"temp":7.4,"time":"2025-11-18T14:00Z","wind":11.2},{"cloud":100,"dark":false,"high":100,"local":"17:00","low":35,"mid":22,"precip":0.0,"rh":90,"temp":6.5,"time":"2025-11-18T15:00Z","wind":13.7},{"cloud":100,"dark":false,"high":100,"local":"18:00","low":16,"mid":82,"precip":0.0,"rh":89,"temp":6.0,"time":"2025-11-18T16:00Z","wind":15.1},{"cloud":100,"dark":true,"high":100,"local":"19:00","low":80,"mid":100,"precip":0.1,"rh":91,"temp":6.1,"time":"2025-11-18T17:00Z","wind":15.7},{"cloud":100,"dark":true,"high":100,"local":"20:00","low":100,"mid":92,"precip":0.6,"rh":96,"temp":6.6,"time":"2025-11-18T18:00Z","wind":18.7},{"cloud":100,"dark":true,"high":100,"local":"21:00","low":99,"mid":20,"precip":0.1,"rh":95,"temp":7.4,"time":"2025-11-18T19:00Z","wind":19.7},{"cloud":100,"dark":true,"high":100,"local":"22:00","low":93,"mid":97,"precip":0.2,"rh":94,"temp":7.5,"time":"2025-11-18T20:00Z","wind":22.8},{"cloud":100,"dark":true,"high":100,"local":"23:00","low":27,"mid":100,"precip":0.7,"rh":96,"temp":6.8,"time":"2025-11-18T21:00Z","wind":23.8},{"cloud":100,"dark":true,"high":100,"local":"00:00","low":47,"mid":94,"precip":1.3,"rh":97,"temp":6.5,"time":"2025-11-18T22:00Z","wind":24.7},{"cloud":100,"dark":true,"high":100,"local":"01:00","low":35,"mid":100,"precip":2.0,"rh":95,"temp":6.2,"time":"2025-11-18T23:00Z","wind":24.7},{"cloud":100,"dark":true,"high":98,"local":"02:00","low":23,"mid":100,"precip":1.9,"rh":94,"temp":6.1,"time":"2025-11-19T00:00Z","wind":24.9},{"cloud":100,"dark":true,"high":100,"local":"03:00","low":10,"mid":97,"precip":0.8,"rh":87,"temp":6.5,"time":"2025-11-19T01:00Z","wind":25.2},{"cloud":100,"dark":true,"high":100,"local":"04:00","low":11,"mid":91,"precip":0.6,"rh":95,"temp":5.7,"time":"2025-11-19T02:00Z","wind":18.9},{"cloud":100,"dark":true,"high":100,"local":"05:00","low":18,"mid":89,"precip":0.6,"rh":96,"temp":5.7,"time":"2025-11-19T03:00Z","wind":17.1},{"cloud":100,"dark":false,"high":100,"local":"06:00","low":15,"mid":98,"precip":1.0,"rh":96,"temp":6.0,"time":"2025-11-19T04:00Z","wind":17.6},{"cloud":100,"dark":false,"high":100,"local":"07:00","low":8,"mid":97,"precip":0.5,"rh":95,"temp":5.5,"time":"2025-11-19T05:00Z","wind":15.1},{"cloud":100,"dark":false,"high":74,"local":"08:00","low":21,"mid":100,"precip":0.3,"rh":97,"temp":4.8,"time":"2025-11-19T06:00Z","wind":14.0}],"forecast_source":"history","forecast_updated_at":"2026-10-19T16:04:37Z","limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2025-11-18T16:35:03Z","dark_hours":11.05,"dark_to":"2025-11-19T03:38:00Z","moon":{"illumination":0.018,"phase":"new moon","waxing":false},"moon_free_dark_hours":11.03,"moonrise":"2025-11-19T04:37:37Z","moonset":"2025-11-18T13:33:00Z","sunrise":"2025-11-19T05:15:03Z","sunset":"2025-11-18T14:58:13Z","twilight":{"astronomical":{"end":"2025-11-18T16:35:03Z","start":"2025-11-19T03:38:00Z"},"civil":{"end":"2025-11-18T15:28:18Z","start":"2025-11-19T04:44:53Z"},"nautical":{"end":"2025-11-18T16:02:06Z","start":"2025-11-19T04:11:01Z"}},"window_end":"2025-11-19T10:00:00Z","window_start":"2025-11-18T10:00:00Z"},"night_date":"2025-11-18","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":[]}
