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: 04-09 (58), 04-06 (57), 04-08 (57), 04-04 (56), 04-05 (56) — 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	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°
2033-04-02 Sat	53	—	unknown	03:20–05:25 (good, 2.08 h)	87.2° 09:35	8.01	14%	86.3°
2033-04-03 Sun	54	—	unknown	03:15–05:25 (good, 2.17 h)	87.2° 09:30	7.96	23%	94.6°
2033-04-04 Mon	56	—	unknown	03:10–05:25 (good, 2.25 h)	87.2° 09:25	7.9	33%	102.4°
2033-04-05 Tue	56	—	unknown	03:05–05:20 (good, 2.25 h)	87.2° 09:20	7.84	43%	109.4°
2033-04-06 Wed	57	—	unknown	03:05–05:20 (good, 2.25 h)	87.2° 09:20	7.79	53%	115.6°
2033-04-07 Thu	56	—	unknown	03:05–05:15 (good, 2.17 h)	87.2° 09:15	7.73	63%	120.5°
2033-04-08 Fri	57	—	unknown	03:00–05:15 (good, 2.25 h)	87.2° 09:10	7.68	72%	124.1°
2033-04-09 Sat	58	—	unknown	03:00–05:15 (good, 2.25 h)	87.2° 09:05	7.62	80%	125.9°
2033-04-10 Sun	56	—	unknown	03:00–05:10 (good, 2.17 h)	87.2° 09:00	7.56	87%	126.0°
2033-04-11 Mon	51	—	unknown	02:55–05:10 (good, 2.25 h)	87.2° 09:00	7.51	93%	124.4°
2033-04-12 Tue	51	—	unknown	02:50–05:05 (good, 2.25 h)	87.2° 08:55	7.45	97%	121.1°
2033-04-13 Wed	49	—	unknown	02:50–05:05 (good, 2.25 h)	87.2° 08:50	7.39	99%	116.6°
2033-04-14 Thu	46	—	unknown	02:55–05:05 (good, 2.17 h)	87.2° 08:45	7.33	100%	110.9°
2033-04-15 Fri	43	—	unknown	02:55–05:00 (good, 2.08 h)	87.2° 08:40	7.28	99%	104.5°
2033-04-16 Sat	40	—	unknown	02:55–05:00 (good, 2.08 h)	87.2° 08:40	7.22	96%	97.6°
2033-04-17 Sun	38	—	unknown	02:50–05:00 (good, 2.17 h)	87.2° 08:35	7.16	91%	90.3°
2033-04-18 Mon	37	—	unknown	02:50–04:55 (good, 2.08 h)	87.2° 08:30	7.1	84%	83.0°
2033-04-19 Tue	38	—	unknown	02:40–04:55 (good, 2.25 h)	87.2° 08:25	7.04	76%	75.7°

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.