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: 03-27 (100), 03-28 (100), 03-29 (100), 03-30 (100), 03-31 (100) — by astronomy; check the weather when the night is within four days.

2033-03-21astronomy score per night — click a bar for that night2033-04-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-03-21 Mon	50	—	unknown	01:35–04:50 (good, 3.25 h)	87.1° 07:00	8.65	71%	64.9°
2033-03-22 Tue	57	—	unknown	01:25–04:50 (good, 3.42 h)	87.1° 06:55	8.6	62%	60.6°
2033-03-23 Wed	68	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.55	52%	57.6°
2033-03-24 Thu	81	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:45	8.5	41%	56.5°
2033-03-25 Fri	90	—	unknown	00:50–04:40 (good, 3.83 h)	87.1° 06:45	8.44	30%	57.4°
2033-03-26 Sat	99	—	unknown	00:45–05:40 (good, 3.92 h)	87.1° 07:40	8.39	20%	60.5°
2033-03-27 Sun	100	—	unknown	01:40–05:40 (good, 4.0 h)	87.1° 07:35	8.34	12%	65.6°
2033-03-28 Mon	100	—	unknown	01:35–05:35 (good, 4.0 h)	87.1° 07:30	8.28	5%	72.3°
2033-03-29 Tue	100	—	unknown	01:35–05:35 (good, 4.0 h)	87.1° 07:30	8.23	1%	80.1°
2033-03-30 Wed	100	—	unknown	01:30–05:35 (good, 4.08 h)	87.1° 07:25	8.18	0%	88.4°
2033-03-31 Thu	100	—	unknown	01:25–05:30 (good, 4.08 h)	87.1° 07:20	8.12	2%	96.7°
2033-04-01 Fri	100	—	unknown	01:20–05:30 (good, 4.17 h)	87.1° 07:15	8.07	7%	104.5°
2033-04-02 Sat	100	—	unknown	01:20–05:25 (good, 4.08 h)	87.1° 07:10	8.01	14%	111.5°
2033-04-03 Sun	100	—	unknown	01:15–05:25 (good, 4.17 h)	87.1° 07:10	7.96	23%	117.1°
2033-04-04 Mon	100	—	unknown	01:10–05:25 (good, 4.25 h)	87.1° 07:05	7.9	33%	121.1°
2033-04-05 Tue	100	—	unknown	01:10–05:20 (good, 4.17 h)	87.1° 07:00	7.84	43%	123.2°
2033-04-06 Wed	100	—	unknown	01:05–05:20 (good, 4.25 h)	87.1° 06:55	7.79	53%	123.4°
2033-04-07 Thu	100	—	unknown	01:05–05:15 (good, 4.17 h)	87.1° 06:50	7.73	63%	121.9°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-03-21&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.