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: 03-11 (35), 03-08 (34), 03-10 (34), 03-12 (34), 03-09 (33) — by astronomy; check the weather when the night is within four days.

2033-02-19astronomy score per night — click a bar for that night2033-03-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-02-19 Sat	15	—	unknown	05:20–05:40 (good, 0.33 h)	87.3° 11:20	10.07	74%	107.9°
2033-02-20 Sun	15	—	unknown	05:15–05:40 (good, 0.42 h)	87.3° 11:15	10.03	65%	101.2°
2033-02-21 Mon	16	—	unknown	05:15–05:35 (good, 0.33 h)	87.3° 11:10	9.99	56%	94.1°
2033-02-22 Tue	17	—	unknown	05:05–05:35 (good, 0.5 h)	87.3° 11:05	9.94	46%	86.6°
2033-02-23 Wed	18	—	unknown	05:00–05:35 (good, 0.58 h)	87.3° 11:05	9.9	35%	79.0°
2033-02-24 Thu	20	—	unknown	04:50–05:30 (good, 0.67 h)	87.3° 11:00	9.86	25%	71.6°
2033-02-25 Fri	23	—	unknown	04:45–05:30 (good, 0.75 h)	87.3° 10:55	9.81	16%	64.7°
2033-02-26 Sat	25	—	unknown	04:35–05:30 (good, 0.92 h)	87.3° 10:50	9.77	9%	59.0°
2033-02-27 Sun	27	—	unknown	04:30–05:30 (good, 1.0 h)	87.3° 10:45	9.72	3%	55.1°
2033-02-28 Mon	27	—	unknown	04:30–05:25 (good, 0.92 h)	87.3° 10:45	9.68	0%	53.8°
2033-03-01 Tue	28	—	unknown	04:25–05:25 (good, 1.0 h)	87.3° 10:40	9.63	1%	55.4°
2033-03-02 Wed	29	—	unknown	04:20–05:25 (good, 1.08 h)	87.3° 10:35	9.59	4%	59.6°
2033-03-03 Thu	29	—	unknown	04:15–05:20 (good, 1.08 h)	87.3° 10:30	9.54	10%	65.8°
2033-03-04 Fri	30	—	unknown	04:15–05:20 (good, 1.08 h)	87.3° 10:30	9.49	18%	73.2°
2033-03-05 Sat	31	—	unknown	04:10–05:20 (good, 1.17 h)	87.3° 10:25	9.45	28%	81.2°
2033-03-06 Sun	31	—	unknown	04:05–05:15 (good, 1.17 h)	87.3° 10:20	9.4	38%	89.4°
2033-03-07 Mon	32	—	unknown	04:00–05:15 (good, 1.25 h)	87.3° 10:15	9.35	49%	97.2°
2033-03-08 Tue	34	—	unknown	03:55–05:15 (good, 1.33 h)	87.3° 10:10	9.31	59%	104.6°
2033-03-09 Wed	33	—	unknown	03:55–05:10 (good, 1.25 h)	87.3° 10:10	9.26	69%	111.3°
2033-03-10 Thu	34	—	unknown	03:50–05:10 (good, 1.33 h)	87.3° 10:05	9.21	78%	117.0°
2033-03-11 Fri	35	—	unknown	03:55–05:10 (good, 1.25 h)	87.3° 10:00	9.16	85%	121.6°
2033-03-12 Sat	34	—	unknown	03:50–05:05 (good, 1.25 h)	87.3° 09:55	9.11	91%	124.7°
2033-03-13 Sun	31	—	unknown	03:50–05:05 (good, 1.25 h)	87.3° 09:50	9.06	96%	126.2°
2033-03-14 Mon	31	—	unknown	03:45–05:05 (good, 1.33 h)	87.3° 09:50	9.01	99%	125.8°
2033-03-15 Tue	31	—	unknown	03:45–05:00 (good, 1.25 h)	87.3° 09:45	8.96	100%	123.7°
2033-03-16 Wed	31	—	unknown	03:40–05:00 (good, 1.33 h)	87.3° 09:40	8.91	99%	120.1°
2033-03-17 Thu	30	—	unknown	03:40–04:55 (good, 1.25 h)	87.3° 09:35	8.86	97%	115.2°
2033-03-18 Fri	29	—	unknown	03:40–04:55 (good, 1.25 h)	87.3° 09:30	8.81	93%	109.4°
2033-03-19 Sat	28	—	unknown	03:35–04:55 (good, 1.33 h)	87.3° 09:30	8.76	87%	102.9°
2033-03-20 Sun	27	—	unknown	03:35–04:50 (good, 1.25 h)	87.3° 09:25	8.71	80%	95.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-02-19&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.