Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for HD 189733: 04-19 (62), 04-16 (61), 04-17 (61), 04-18 (61), 04-20 (61) — by astronomy; check the weather when the night is within four days.

2032-03-27astronomy score per night — click a bar for that night2032-04-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-27 Sat	29	—	unknown	04:15–05:40 (good, 1.42 h)	71.1° 09:00	8.32	99%	106.4°
2032-03-28 Sun	26	—	unknown	04:20–05:35 (good, 1.25 h)	71.1° 08:55	8.27	96%	96.4°
2032-03-29 Mon	24	—	unknown	04:40–05:35 (good, 0.92 h)	71.1° 08:50	8.22	92%	86.1°
2032-03-30 Tue	22	—	unknown	04:55–05:30 (good, 0.58 h)	71.1° 08:45	8.16	85%	75.7°
2032-03-31 Wed	22	—	unknown	05:00–05:30 (good, 0.5 h)	71.1° 08:45	8.11	76%	65.5°
2032-04-01 Thu	24	—	unknown	04:35–05:30 (good, 0.92 h)	71.1° 08:40	8.05	66%	55.7°
2032-04-02 Fri	26	—	unknown	04:00–05:25 (good, 1.42 h)	71.1° 08:35	8.0	56%	47.0°
2032-04-03 Sat	32	—	unknown	03:45–05:25 (good, 1.67 h)	71.1° 08:30	7.94	44%	40.3°
2032-04-04 Sun	39	—	unknown	03:25–05:25 (good, 2.0 h)	71.1° 08:25	7.89	33%	37.1°
2032-04-05 Mon	45	—	unknown	03:20–05:20 (good, 2.0 h)	71.1° 08:25	7.83	23%	38.4°
2032-04-06 Tue	51	—	unknown	03:20–05:20 (good, 2.0 h)	71.1° 08:20	7.77	14%	44.0°
2032-04-07 Wed	52	—	unknown	03:15–05:15 (good, 2.0 h)	71.1° 08:15	7.72	6%	52.5°
2032-04-08 Thu	53	—	unknown	03:10–05:15 (good, 2.08 h)	71.1° 08:10	7.66	2%	62.7°
2032-04-09 Fri	54	—	unknown	03:05–05:15 (good, 2.17 h)	71.1° 08:05	7.61	0%	73.6°
2032-04-10 Sat	54	—	unknown	03:00–05:10 (good, 2.17 h)	71.1° 08:05	7.55	1%	84.8°
2032-04-11 Sun	56	—	unknown	03:00–05:10 (good, 2.17 h)	71.1° 08:00	7.49	4%	95.8°
2032-04-12 Mon	57	—	unknown	02:55–05:05 (good, 2.17 h)	71.1° 07:55	7.43	10%	106.5°
2032-04-13 Tue	57	—	unknown	02:50–05:05 (good, 2.25 h)	71.1° 07:50	7.38	16%	116.4°
2032-04-14 Wed	59	—	unknown	02:45–05:05 (good, 2.33 h)	71.1° 07:50	7.32	25%	125.4°
2032-04-15 Thu	60	—	unknown	02:40–05:00 (good, 2.33 h)	71.1° 07:45	7.26	34%	133.2°
2032-04-16 Fri	61	—	unknown	02:40–05:00 (good, 2.33 h)	71.1° 07:40	7.2	43%	139.1°
2032-04-17 Sat	61	—	unknown	02:40–04:55 (good, 2.25 h)	71.1° 07:35	7.15	53%	142.5°
2032-04-18 Sun	61	—	unknown	02:35–04:55 (good, 2.33 h)	71.1° 07:30	7.09	62%	142.8°
2032-04-19 Mon	62	—	unknown	02:35–04:55 (good, 2.33 h)	71.1° 07:30	7.03	71%	140.1°
2032-04-20 Tue	61	—	unknown	02:30–04:50 (good, 2.33 h)	71.1° 07:25	6.97	79%	134.7°
2032-04-21 Wed	61	—	unknown	02:25–04:50 (good, 2.42 h)	71.1° 07:20	6.91	86%	127.5°
2032-04-22 Thu	54	—	unknown	02:25–04:45 (good, 2.33 h)	71.1° 07:15	6.86	92%	119.0°
2032-04-23 Fri	50	—	unknown	02:25–04:45 (good, 2.33 h)	71.1° 07:10	6.8	97%	109.6°
2032-04-24 Sat	44	—	unknown	02:30–04:45 (good, 2.25 h)	71.1° 07:10	6.74	100%	99.6°
2032-04-25 Sun	37	—	unknown	03:00–04:40 (good, 1.67 h)	71.1° 07:05	6.68	100%	89.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-27&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.