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 North America Nebula: 03-27 (48), 03-28 (48), 03-29 (48), 03-30 (48), 03-25 (47) — by astronomy; check the weather when the night is within four days.

2034-03-10astronomy score per night — click a bar for that night2034-04-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-03-10 Fri	23	—	unknown	04:15–05:10 (good, 0.92 h)	87.2° 10:05	9.22	72%	94.4°
2034-03-11 Sat	24	—	unknown	04:10–05:10 (good, 1.0 h)	87.2° 10:00	9.17	63%	87.6°
2034-03-12 Sun	25	—	unknown	04:00–05:05 (good, 1.08 h)	87.2° 09:55	9.12	53%	80.8°
2034-03-13 Mon	27	—	unknown	03:55–05:05 (good, 1.17 h)	87.2° 09:55	9.07	44%	74.2°
2034-03-14 Tue	30	—	unknown	03:45–05:05 (good, 1.33 h)	87.2° 09:50	9.02	34%	67.9°
2034-03-15 Wed	33	—	unknown	03:30–05:00 (good, 1.5 h)	87.2° 09:45	8.97	24%	62.4°
2034-03-16 Thu	37	—	unknown	03:25–05:00 (good, 1.58 h)	87.2° 09:40	8.92	16%	58.1°
2034-03-17 Fri	41	—	unknown	03:20–05:00 (good, 1.67 h)	87.2° 09:35	8.87	8%	55.6°
2034-03-18 Sat	41	—	unknown	03:20–04:55 (good, 1.58 h)	87.2° 09:35	8.82	3%	55.3°
2034-03-19 Sun	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.2° 09:30	8.77	0%	57.5°
2034-03-20 Mon	42	—	unknown	03:10–04:50 (good, 1.67 h)	87.2° 09:25	8.72	0%	62.1°
2034-03-21 Tue	44	—	unknown	03:05–04:50 (good, 1.75 h)	87.2° 09:20	8.67	3%	68.5°
2034-03-22 Wed	45	—	unknown	03:05–04:50 (good, 1.75 h)	87.2° 09:20	8.61	9%	76.1°
2034-03-23 Thu	45	—	unknown	03:00–04:45 (good, 1.75 h)	87.2° 09:15	8.56	17%	84.3°
2034-03-24 Fri	46	—	unknown	02:55–04:45 (good, 1.83 h)	87.2° 09:10	8.51	27%	92.5°
2034-03-25 Sat	47	—	unknown	02:50–05:45 (good, 1.92 h)	87.2° 10:05	8.46	38%	100.5°
2034-03-26 Sun	47	—	unknown	03:45–05:40 (good, 1.92 h)	87.2° 10:00	8.4	49%	107.9°
2034-03-27 Mon	48	—	unknown	03:45–05:40 (good, 1.92 h)	87.2° 10:00	8.35	60%	114.3°
2034-03-28 Tue	48	—	unknown	03:45–05:35 (good, 1.83 h)	87.2° 09:55	8.3	70%	119.4°
2034-03-29 Wed	48	—	unknown	03:45–05:35 (good, 1.83 h)	87.2° 09:50	8.24	79%	123.0°
2034-03-30 Thu	48	—	unknown	03:40–05:35 (good, 1.92 h)	87.2° 09:45	8.19	86%	124.7°
2034-03-31 Fri	43	—	unknown	03:40–05:30 (good, 1.83 h)	87.2° 09:40	8.13	92%	124.6°
2034-04-01 Sat	43	—	unknown	03:35–05:30 (good, 1.92 h)	87.2° 09:40	8.08	97%	122.7°
2034-04-02 Sun	42	—	unknown	03:35–05:25 (good, 1.83 h)	87.2° 09:35	8.02	99%	119.3°
2034-04-03 Mon	40	—	unknown	03:35–05:25 (good, 1.83 h)	87.2° 09:30	7.97	100%	114.6°
2034-04-04 Tue	38	—	unknown	03:35–05:25 (good, 1.83 h)	87.2° 09:25	7.91	99%	109.1°
2034-04-05 Wed	36	—	unknown	03:35–05:20 (good, 1.75 h)	87.2° 09:25	7.86	96%	102.9°
2034-04-06 Thu	34	—	unknown	03:35–05:20 (good, 1.75 h)	87.2° 09:20	7.8	91%	96.3°
2034-04-07 Fri	34	—	unknown	03:30–05:20 (good, 1.83 h)	87.2° 09:15	7.75	85%	89.6°
2034-04-08 Sat	33	—	unknown	03:25–05:15 (good, 1.83 h)	87.2° 09:10	7.69	78%	82.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-03-10&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.