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: 05-05 (85), 05-03 (83), 05-04 (83), 05-02 (82), 04-30 (81) — by astronomy; check the weather when the night is within four days.

2033-04-06astronomy score per night — click a bar for that night2033-05-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-04-06 Wed	57	—	unknown	03:05–05:20 (good, 2.25 h)	87.3° 09:20	7.79	53%	115.6°
2033-04-07 Thu	56	—	unknown	03:05–05:15 (good, 2.17 h)	87.3° 09:15	7.73	63%	120.6°
2033-04-08 Fri	57	—	unknown	03:00–05:15 (good, 2.25 h)	87.3° 09:10	7.68	72%	124.1°
2033-04-09 Sat	58	—	unknown	03:00–05:15 (good, 2.25 h)	87.3° 09:05	7.62	80%	126.0°
2033-04-10 Sun	56	—	unknown	03:00–05:10 (good, 2.17 h)	87.3° 09:00	7.56	87%	126.1°
2033-04-11 Mon	51	—	unknown	02:55–05:10 (good, 2.25 h)	87.3° 09:00	7.51	93%	124.5°
2033-04-12 Tue	50	—	unknown	02:55–05:05 (good, 2.17 h)	87.3° 08:55	7.45	97%	121.2°
2033-04-13 Wed	48	—	unknown	02:50–05:05 (good, 2.25 h)	87.3° 08:50	7.39	99%	116.6°
2033-04-14 Thu	46	—	unknown	02:55–05:05 (good, 2.17 h)	87.3° 08:45	7.33	100%	111.0°
2033-04-15 Fri	42	—	unknown	02:55–05:00 (good, 2.08 h)	87.3° 08:40	7.28	99%	104.6°
2033-04-16 Sat	39	—	unknown	02:55–05:00 (good, 2.08 h)	87.3° 08:40	7.22	96%	97.6°
2033-04-17 Sun	38	—	unknown	02:55–05:00 (good, 2.08 h)	87.3° 08:35	7.16	91%	90.3°
2033-04-18 Mon	37	—	unknown	02:50–04:55 (good, 2.08 h)	87.3° 08:30	7.1	84%	82.9°
2033-04-19 Tue	38	—	unknown	02:45–04:55 (good, 2.17 h)	87.3° 08:25	7.04	76%	75.6°
2033-04-20 Wed	40	—	unknown	02:35–04:50 (good, 2.25 h)	87.3° 08:25	6.99	67%	68.7°
2033-04-21 Thu	46	—	unknown	02:25–04:50 (good, 2.42 h)	87.3° 08:20	6.93	56%	62.6°
2033-04-22 Fri	55	—	unknown	02:00–04:50 (good, 2.83 h)	87.3° 08:15	6.87	45%	57.6°
2033-04-23 Sat	62	—	unknown	01:55–04:45 (good, 2.83 h)	87.3° 08:10	6.81	34%	54.5°
2033-04-24 Sun	70	—	unknown	01:50–04:45 (good, 2.92 h)	87.3° 08:05	6.75	24%	53.8°
2033-04-25 Mon	73	—	unknown	01:50–04:40 (good, 2.83 h)	87.3° 08:05	6.69	14%	55.7°
2033-04-26 Tue	76	—	unknown	01:45–04:40 (good, 2.92 h)	87.3° 08:00	6.64	7%	60.1°
2033-04-27 Wed	78	—	unknown	01:40–04:40 (good, 3.0 h)	87.3° 07:55	6.58	2%	66.5°
2033-04-28 Thu	78	—	unknown	01:35–04:35 (good, 3.0 h)	87.3° 07:50	6.52	0%	74.2°
2033-04-29 Fri	79	—	unknown	01:35–04:35 (good, 3.0 h)	87.3° 07:45	6.46	1%	82.5°
2033-04-30 Sat	81	—	unknown	01:30–04:35 (good, 3.08 h)	87.3° 07:45	6.4	5%	91.0°
2033-05-01 Sun	81	—	unknown	01:25–04:30 (good, 3.08 h)	87.3° 07:40	6.35	11%	99.3°
2033-05-02 Mon	82	—	unknown	01:20–04:30 (good, 3.17 h)	87.3° 07:35	6.29	18%	106.9°
2033-05-03 Tue	83	—	unknown	01:15–04:25 (good, 3.17 h)	87.3° 07:30	6.23	27%	113.6°
2033-05-04 Wed	83	—	unknown	01:15–04:25 (good, 3.17 h)	87.3° 07:30	6.17	37%	119.1°
2033-05-05 Thu	85	—	unknown	01:15–04:25 (good, 3.17 h)	87.3° 07:25	6.12	46%	123.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-04-06&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.