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: 03-22 (99), 03-21 (98), 03-19 (97), 03-20 (97), 03-18 (96) — by astronomy; check the weather when the night is within four days.

2034-02-21astronomy score per night — click a bar for that night2034-03-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-02-21 Tue	67	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:50	10.0	12%	89.9°
2034-02-22 Wed	69	—	unknown	02:50–05:35 (good, 2.75 h)	87.1° 08:45	9.95	20%	97.9°
2034-02-23 Thu	71	—	unknown	02:50–05:35 (good, 2.75 h)	87.1° 08:40	9.91	30%	105.4°
2034-02-24 Fri	71	—	unknown	02:45–05:30 (good, 2.75 h)	87.1° 08:40	9.87	42%	112.1°
2034-02-25 Sat	72	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:35	9.82	53%	117.5°
2034-02-26 Sun	73	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:30	9.78	64%	121.3°
2034-02-27 Mon	74	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:25	9.73	74%	123.2°
2034-02-28 Tue	73	—	unknown	02:35–05:25 (good, 2.83 h)	87.1° 08:25	9.69	83%	123.1°
2034-03-01 Wed	71	—	unknown	02:35–05:25 (good, 2.83 h)	87.1° 08:20	9.64	90%	121.0°
2034-03-02 Thu	64	—	unknown	02:35–05:25 (good, 2.83 h)	87.1° 08:15	9.6	95%	117.2°
2034-03-03 Fri	59	—	unknown	02:35–05:20 (good, 2.75 h)	87.1° 08:10	9.55	99%	112.3°
2034-03-04 Sat	55	—	unknown	02:40–05:20 (good, 2.67 h)	87.1° 08:05	9.51	100%	106.5°
2034-03-05 Sun	51	—	unknown	02:40–05:20 (good, 2.67 h)	87.1° 08:05	9.46	99%	100.1°
2034-03-06 Mon	46	—	unknown	03:05–05:15 (good, 2.17 h)	87.1° 08:00	9.41	97%	93.5°
2034-03-07 Tue	43	—	unknown	03:20–05:15 (good, 1.92 h)	87.1° 07:55	9.36	93%	86.9°
2034-03-08 Wed	43	—	unknown	03:25–05:15 (good, 1.83 h)	87.1° 07:50	9.32	87%	80.5°
2034-03-09 Thu	43	—	unknown	03:15–05:10 (good, 1.92 h)	87.1° 07:45	9.27	80%	74.3°
2034-03-10 Fri	45	—	unknown	02:35–05:10 (good, 2.58 h)	87.1° 07:45	9.22	72%	68.7°
2034-03-11 Sat	50	—	unknown	02:10–05:10 (good, 3.0 h)	87.1° 07:40	9.17	63%	63.9°
2034-03-12 Sun	56	—	unknown	02:00–05:05 (good, 3.08 h)	87.1° 07:35	9.12	53%	60.0°
2034-03-13 Mon	65	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.07	44%	57.5°
2034-03-14 Tue	74	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.02	34%	56.5°
2034-03-15 Wed	82	—	unknown	01:30–05:00 (good, 3.5 h)	87.1° 07:25	8.97	24%	57.5°
2034-03-16 Thu	90	—	unknown	01:25–05:00 (good, 3.58 h)	87.1° 07:20	8.92	16%	60.4°
2034-03-17 Fri	95	—	unknown	01:20–05:00 (good, 3.67 h)	87.1° 07:15	8.87	8%	65.1°
2034-03-18 Sat	96	—	unknown	01:20–04:55 (good, 3.58 h)	87.1° 07:10	8.82	3%	71.3°
2034-03-19 Sun	97	—	unknown	01:15–04:55 (good, 3.67 h)	87.1° 07:10	8.77	0%	78.6°
2034-03-20 Mon	97	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:05	8.72	0%	86.7°
2034-03-21 Tue	98	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.67	3%	94.9°
2034-03-22 Wed	99	—	unknown	01:00–04:50 (good, 3.83 h)	87.1° 06:55	8.61	9%	102.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-02-21&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.