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 V1057 Cyg: 04-15 (66), 04-16 (66), 04-17 (66), 04-14 (65), 04-13 (63) — by astronomy; check the weather when the night is within four days.

2032-03-19astronomy score per night — click a bar for that night2032-04-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-19 Fri	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.3° 09:30	8.75	60%	110.7°
2032-03-20 Sat	42	—	unknown	03:10–04:50 (good, 1.67 h)	87.3° 09:25	8.69	69%	116.5°
2032-03-21 Sun	43	—	unknown	03:10–04:50 (good, 1.67 h)	87.3° 09:20	8.64	78%	121.3°
2032-03-22 Mon	43	—	unknown	03:10–04:50 (good, 1.67 h)	87.3° 09:15	8.59	85%	124.9°
2032-03-23 Tue	42	—	unknown	03:10–04:45 (good, 1.58 h)	87.3° 09:10	8.54	91%	126.8°
2032-03-24 Wed	38	—	unknown	03:05–04:45 (good, 1.67 h)	87.3° 09:10	8.48	96%	127.0°
2032-03-25 Thu	38	—	unknown	03:00–04:40 (good, 1.67 h)	87.3° 09:05	8.43	99%	125.2°
2032-03-26 Fri	38	—	unknown	03:00–04:40 (good, 1.67 h)	87.3° 09:00	8.38	100%	121.7°
2032-03-27 Sat	37	—	unknown	04:00–05:40 (good, 1.67 h)	87.3° 09:55	8.32	99%	116.6°
2032-03-28 Sun	35	—	unknown	04:00–05:35 (good, 1.58 h)	87.3° 09:50	8.27	96%	110.3°
2032-03-29 Mon	33	—	unknown	04:00–05:35 (good, 1.58 h)	87.3° 09:50	8.22	92%	103.2°
2032-03-30 Tue	32	—	unknown	03:55–05:30 (good, 1.58 h)	87.3° 09:45	8.16	85%	95.5°
2032-03-31 Wed	32	—	unknown	03:50–05:30 (good, 1.67 h)	87.3° 09:40	8.11	76%	87.4°
2032-04-01 Thu	33	—	unknown	03:45–05:30 (good, 1.75 h)	87.3° 09:35	8.05	66%	79.4°
2032-04-02 Fri	35	—	unknown	03:40–05:25 (good, 1.75 h)	87.3° 09:35	8.0	56%	71.6°
2032-04-03 Sat	40	—	unknown	03:30–05:25 (good, 1.92 h)	87.3° 09:30	7.94	44%	64.4°
2032-04-04 Sun	46	—	unknown	03:10–05:25 (good, 2.25 h)	87.3° 09:25	7.89	33%	58.5°
2032-04-05 Mon	51	—	unknown	03:05–05:20 (good, 2.25 h)	87.3° 09:20	7.83	23%	54.4°
2032-04-06 Tue	57	—	unknown	03:00–05:20 (good, 2.33 h)	87.3° 09:15	7.77	14%	52.8°
2032-04-07 Wed	57	—	unknown	03:00–05:15 (good, 2.25 h)	87.3° 09:15	7.72	6%	54.0°
2032-04-08 Thu	59	—	unknown	02:55–05:15 (good, 2.33 h)	87.3° 09:10	7.66	2%	57.7°
2032-04-09 Fri	60	—	unknown	02:50–05:15 (good, 2.42 h)	87.3° 09:05	7.61	0%	63.4°
2032-04-10 Sat	60	—	unknown	02:45–05:10 (good, 2.42 h)	87.3° 09:00	7.55	1%	70.5°
2032-04-11 Sun	62	—	unknown	02:40–05:10 (good, 2.5 h)	87.3° 08:55	7.49	4%	78.2°
2032-04-12 Mon	62	—	unknown	02:40–05:05 (good, 2.42 h)	87.3° 08:55	7.43	10%	86.2°
2032-04-13 Tue	63	—	unknown	02:35–05:05 (good, 2.5 h)	87.3° 08:50	7.38	16%	94.1°
2032-04-14 Wed	65	—	unknown	02:30–05:05 (good, 2.58 h)	87.3° 08:45	7.32	25%	101.6°
2032-04-15 Thu	66	—	unknown	02:25–05:00 (good, 2.58 h)	87.3° 08:40	7.26	34%	108.6°
2032-04-16 Fri	66	—	unknown	02:25–05:00 (good, 2.58 h)	87.3° 08:35	7.2	43%	114.8°
2032-04-17 Sat	66	—	unknown	02:25–04:55 (good, 2.5 h)	87.3° 08:35	7.15	53%	120.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-19&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.