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.

2033-03-13astronomy score per night — click a bar for that night2033-04-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-03-13 Sun	70	—	unknown	01:55–05:05 (good, 3.17 h)	87.1° 07:30	9.06	96%	113.3°
2033-03-14 Mon	66	—	unknown	01:55–05:05 (good, 3.17 h)	87.1° 07:25	9.01	99%	107.9°
2033-03-15 Tue	60	—	unknown	02:00–05:00 (good, 3.0 h)	87.1° 07:25	8.96	100%	101.9°
2033-03-16 Wed	54	—	unknown	02:20–05:00 (good, 2.67 h)	87.1° 07:20	8.91	99%	95.6°
2033-03-17 Thu	50	—	unknown	02:40–04:55 (good, 2.25 h)	87.1° 07:15	8.86	97%	89.1°
2033-03-18 Fri	47	—	unknown	02:55–04:55 (good, 2.0 h)	87.1° 07:10	8.81	93%	82.5°
2033-03-19 Sat	46	—	unknown	02:55–04:55 (good, 2.0 h)	87.1° 07:05	8.76	87%	76.2°
2033-03-20 Sun	47	—	unknown	02:30–04:50 (good, 2.33 h)	87.1° 07:05	8.71	80%	70.2°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-03-13&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.