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 Vega: 04-08 (100), 04-09 (100), 04-10 (100), 04-23 (100), 04-24 (100) — by astronomy; check the weather when the night is within four days.

2033-04-08astronomy score per night — click a bar for that night2033-05-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-04-08 Fri	100	—	unknown	01:05–05:15 (good, 4.17 h)	87.1° 06:50	7.68	72%	118.8°
2033-04-09 Sat	100	—	unknown	01:05–05:15 (good, 4.17 h)	87.1° 06:45	7.62	80%	114.6°
2033-04-10 Sun	100	—	unknown	01:05–05:10 (good, 4.08 h)	87.1° 06:40	7.56	87%	109.4°
2033-04-11 Mon	83	—	unknown	01:05–05:10 (good, 4.08 h)	87.1° 06:35	7.51	93%	103.6°
2033-04-12 Tue	75	—	unknown	01:20–05:05 (good, 3.75 h)	87.1° 06:35	7.45	97%	97.3°
2033-04-13 Wed	66	—	unknown	01:50–05:05 (good, 3.25 h)	87.1° 06:30	7.39	99%	90.8°
2033-04-14 Thu	60	—	unknown	02:25–05:05 (good, 2.67 h)	87.1° 06:25	7.33	100%	84.2°
2033-04-15 Fri	54	—	unknown	02:50–05:00 (good, 2.17 h)	87.1° 06:20	7.28	99%	77.7°
2033-04-16 Sat	51	—	unknown	03:00–05:00 (good, 2.0 h)	87.1° 06:15	7.22	96%	71.6°
2033-04-17 Sun	51	—	unknown	02:55–05:00 (good, 2.08 h)	87.1° 06:15	7.16	91%	66.1°
2033-04-18 Mon	53	—	unknown	02:00–04:55 (good, 2.92 h)	87.1° 06:10	7.1	84%	61.5°
2033-04-19 Tue	70	—	unknown	00:10–04:55 (good, 4.75 h)	87.1° 06:05	7.04	76%	58.2°
2033-04-20 Wed	85	—	unknown	00:05–04:50 (good, 4.75 h)	87.1° 06:00	6.99	67%	56.6°
2033-04-21 Thu	91	—	unknown	00:05–04:50 (good, 4.75 h)	87.1° 05:55	6.93	56%	56.9°
2033-04-22 Fri	97	—	unknown	00:00–04:50 (good, 4.83 h)	87.1° 05:55	6.87	45%	59.3°
2033-04-23 Sat	100	—	unknown	23:55–04:45 (good, 4.83 h)	87.1° 05:50	6.81	34%	63.6°
2033-04-24 Sun	100	—	unknown	23:50–04:45 (good, 4.92 h)	87.1° 05:45	6.75	24%	69.6°
2033-04-25 Mon	100	—	unknown	23:45–04:40 (good, 4.92 h)	87.1° 05:40	6.69	14%	76.8°
2033-04-26 Tue	100	—	unknown	23:45–04:40 (good, 4.92 h)	87.1° 05:35	6.64	7%	84.7°
2033-04-27 Wed	100	—	unknown	23:40–04:40 (good, 5.0 h)	87.1° 05:35	6.58	2%	93.0°
2033-04-28 Thu	100	—	unknown	23:35–04:35 (good, 5.0 h)	87.1° 05:30	6.52	0%	101.0°
2033-04-29 Fri	100	—	unknown	23:30–04:35 (good, 5.08 h)	87.1° 05:25	6.46	1%	108.5°
2033-04-30 Sat	100	—	unknown	23:25–04:35 (good, 5.17 h)	87.1° 05:20	6.4	5%	114.8°
2033-05-01 Sun	100	—	unknown	23:25–04:30 (good, 5.08 h)	87.1° 05:20	6.35	11%	119.6°
2033-05-02 Mon	100	—	unknown	23:20–04:30 (good, 5.17 h)	87.1° 05:15	6.29	18%	122.6°
2033-05-03 Tue	100	—	unknown	23:20–04:25 (good, 5.08 h)	87.1° 05:10	6.23	27%	123.5°
2033-05-04 Wed	100	—	unknown	23:15–04:25 (good, 5.17 h)	87.1° 05:05	6.17	37%	122.5°
2033-05-05 Thu	100	—	unknown	23:15–04:25 (good, 5.17 h)	87.1° 05:00	6.12	46%	119.9°
2033-05-06 Fri	100	—	unknown	23:10–04:20 (good, 5.17 h)	87.1° 05:00	6.06	56%	115.9°
2033-05-07 Sat	100	—	unknown	23:15–04:20 (good, 5.08 h)	87.1° 04:55	6.0	66%	110.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-04-08&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.