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: 04-01 (53), 03-31 (52), 03-30 (51), 03-29 (50), 03-28 (49) — by astronomy; check the weather when the night is within four days.

2033-03-03astronomy score per night — click a bar for that night2033-04-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-03-03 Thu	29	—	unknown	04:15–05:20 (good, 1.08 h)	87.2° 10:30	9.54	10%	65.8°
2033-03-04 Fri	30	—	unknown	04:10–05:20 (good, 1.17 h)	87.2° 10:25	9.49	18%	73.3°
2033-03-05 Sat	31	—	unknown	04:10–05:20 (good, 1.17 h)	87.2° 10:25	9.45	28%	81.3°
2033-03-06 Sun	31	—	unknown	04:05–05:15 (good, 1.17 h)	87.2° 10:20	9.4	38%	89.3°
2033-03-07 Mon	32	—	unknown	04:00–05:15 (good, 1.25 h)	87.2° 10:15	9.35	49%	97.2°
2033-03-08 Tue	34	—	unknown	03:55–05:15 (good, 1.33 h)	87.2° 10:10	9.31	59%	104.6°
2033-03-09 Wed	33	—	unknown	03:55–05:10 (good, 1.25 h)	87.2° 10:10	9.26	69%	111.2°
2033-03-10 Thu	34	—	unknown	03:50–05:10 (good, 1.33 h)	87.2° 10:05	9.21	78%	117.0°
2033-03-11 Fri	35	—	unknown	03:55–05:10 (good, 1.25 h)	87.2° 10:00	9.16	85%	121.5°
2033-03-12 Sat	34	—	unknown	03:50–05:05 (good, 1.25 h)	87.2° 09:55	9.11	91%	124.7°
2033-03-13 Sun	31	—	unknown	03:50–05:05 (good, 1.25 h)	87.2° 09:50	9.06	96%	126.1°
2033-03-14 Mon	31	—	unknown	03:45–05:05 (good, 1.33 h)	87.2° 09:50	9.01	99%	125.7°
2033-03-15 Tue	31	—	unknown	03:45–05:00 (good, 1.25 h)	87.2° 09:45	8.96	100%	123.7°
2033-03-16 Wed	31	—	unknown	03:40–05:00 (good, 1.33 h)	87.2° 09:40	8.91	99%	120.0°
2033-03-17 Thu	30	—	unknown	03:40–04:55 (good, 1.25 h)	87.2° 09:35	8.86	97%	115.2°
2033-03-18 Fri	29	—	unknown	03:40–04:55 (good, 1.25 h)	87.2° 09:30	8.81	93%	109.4°
2033-03-19 Sat	28	—	unknown	03:35–04:55 (good, 1.33 h)	87.2° 09:30	8.76	87%	102.9°
2033-03-20 Sun	27	—	unknown	03:35–04:50 (good, 1.25 h)	87.2° 09:25	8.71	80%	95.9°
2033-03-21 Mon	28	—	unknown	03:30–04:50 (good, 1.33 h)	87.2° 09:20	8.65	71%	88.6°
2033-03-22 Tue	29	—	unknown	03:25–04:50 (good, 1.42 h)	87.2° 09:15	8.6	62%	81.2°
2033-03-23 Wed	31	—	unknown	03:15–04:45 (good, 1.5 h)	87.2° 09:15	8.55	52%	73.9°
2033-03-24 Thu	34	—	unknown	03:10–04:45 (good, 1.58 h)	87.2° 09:10	8.5	41%	67.1°
2033-03-25 Fri	38	—	unknown	02:50–04:40 (good, 1.83 h)	87.2° 09:05	8.44	30%	61.0°
2033-03-26 Sat	44	—	unknown	02:45–05:40 (good, 1.92 h)	87.2° 10:00	8.39	20%	56.5°
2033-03-27 Sun	48	—	unknown	03:40–05:40 (good, 2.0 h)	87.2° 09:55	8.34	12%	54.0°
2033-03-28 Mon	49	—	unknown	03:40–05:35 (good, 1.92 h)	87.2° 09:55	8.28	5%	54.3°
2033-03-29 Tue	50	—	unknown	03:35–05:35 (good, 2.0 h)	87.2° 09:50	8.23	1%	57.4°
2033-03-30 Wed	51	—	unknown	03:30–05:35 (good, 2.08 h)	87.2° 09:45	8.18	0%	62.8°
2033-03-31 Thu	52	—	unknown	03:25–05:30 (good, 2.08 h)	87.2° 09:40	8.12	2%	69.9°
2033-04-01 Fri	53	—	unknown	03:20–05:30 (good, 2.17 h)	87.2° 09:35	8.07	7%	77.9°

Download: CSV · JSON

💡 API

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