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: 04-08 (59), 04-06 (57), 04-07 (57), 04-05 (51), 04-04 (46) — by astronomy; check the weather when the night is within four days.

2032-03-10astronomy score per night — click a bar for that night2032-04-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-10 Wed	35	—	unknown	03:50–05:10 (good, 1.33 h)	87.3° 10:05	9.2	1%	53.0°
2032-03-11 Thu	35	—	unknown	03:45–05:05 (good, 1.33 h)	87.3° 10:00	9.15	0%	55.3°
2032-03-12 Fri	36	—	unknown	03:40–05:05 (good, 1.42 h)	87.3° 09:55	9.1	2%	60.0°
2032-03-13 Sat	37	—	unknown	03:35–05:05 (good, 1.5 h)	87.3° 09:50	9.05	7%	66.3°
2032-03-14 Sun	38	—	unknown	03:30–05:00 (good, 1.5 h)	87.3° 09:45	9.0	14%	73.7°
2032-03-15 Mon	39	—	unknown	03:30–05:00 (good, 1.5 h)	87.3° 09:45	8.95	22%	81.5°
2032-03-16 Tue	40	—	unknown	03:25–05:00 (good, 1.58 h)	87.3° 09:40	8.9	31%	89.3°
2032-03-17 Wed	40	—	unknown	03:20–04:55 (good, 1.58 h)	87.3° 09:35	8.85	41%	96.9°
2032-03-18 Thu	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.3° 09:30	8.8	51%	104.0°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-10&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.