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: 12-11 (98), 12-12 (97), 12-13 (95), 12-14 (93), 12-15 (91) — by astronomy; check the weather when the night is within four days.

2033-12-11astronomy score per night — click a bar for that night2034-01-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-12-11 Sun	98	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.47	66%	125.2°
2033-12-12 Mon	97	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 15:55	11.47	57%	124.6°
2033-12-13 Tue	95	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 15:50	11.48	47%	122.3°
2033-12-14 Wed	93	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	38%	118.6°
2033-12-15 Thu	91	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	29%	113.7°
2033-12-16 Fri	89	—	unknown	18:35–22:00 (good, 3.42 h)	87.2° 15:40	11.5	21%	108.0°
2033-12-17 Sat	87	—	unknown	18:35–21:55 (good, 3.33 h)	87.2° 15:35	11.5	14%	101.6°
2033-12-18 Sun	85	—	unknown	18:35–21:50 (good, 3.25 h)	87.2° 15:30	11.5	8%	94.8°
2033-12-19 Mon	82	—	unknown	18:35–21:45 (good, 3.17 h)	87.2° 15:25	11.51	4%	87.8°
2033-12-20 Tue	81	—	unknown	18:35–21:45 (good, 3.17 h)	87.2° 15:25	11.51	1%	80.7°
2033-12-21 Wed	78	—	unknown	18:35–21:40 (good, 3.08 h)	87.2° 15:20	11.51	0%	73.8°
2033-12-22 Thu	76	—	unknown	18:35–21:35 (good, 3.0 h)	87.2° 15:15	11.51	2%	67.4°
2033-12-23 Fri	71	—	unknown	18:40–21:30 (good, 2.83 h)	87.2° 15:10	11.5	5%	61.9°
2033-12-24 Sat	67	—	unknown	18:40–21:30 (good, 2.83 h)	87.2° 15:10	11.5	11%	57.7°
2033-12-25 Sun	60	—	unknown	18:40–21:25 (good, 2.75 h)	87.2° 15:05	11.5	18%	55.3°
2033-12-26 Mon	52	—	unknown	18:40–21:10 (good, 2.5 h)	87.2° 15:00	11.49	28%	55.1°
2033-12-27 Tue	44	—	unknown	18:40–20:55 (good, 2.25 h)	87.2° 14:55	11.49	38%	57.1°
2033-12-28 Wed	36	—	unknown	18:40–20:45 (good, 2.08 h)	87.2° 14:50	11.48	49%	61.3°
2033-12-29 Thu	31	—	unknown	18:40–19:55 (good, 1.25 h)	87.2° 14:50	11.48	60%	67.1°
2033-12-30 Fri	28	—	unknown	18:40–19:15 (good, 0.58 h)	87.2° 14:45	11.47	71%	74.2°
2033-12-31 Sat	26	—	unknown	18:45–19:10 (good, 0.42 h)	87.2° 14:40	11.46	81%	82.1°
2034-01-01 Sun	27	—	unknown	18:45–19:30 (good, 0.75 h)	87.2° 14:35	11.45	89%	90.3°
2034-01-02 Mon	30	—	unknown	18:45–20:05 (good, 1.33 h)	87.2° 14:30	11.44	95%	98.4°
2034-01-03 Tue	34	—	unknown	18:45–20:20 (good, 1.58 h)	87.2° 14:30	11.43	99%	106.2°
2034-01-04 Wed	36	—	unknown	18:45–20:25 (good, 1.67 h)	87.2° 14:25	11.41	100%	113.1°
2034-01-05 Thu	39	—	unknown	18:45–20:25 (good, 1.67 h)	87.2° 14:20	11.4	98%	118.7°
2034-01-06 Fri	42	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:15	11.39	95%	122.7°
2034-01-07 Sat	43	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:10	11.37	89%	124.7°
2034-01-08 Sun	42	—	unknown	18:50–20:30 (good, 1.67 h)	87.2° 14:10	11.36	82%	124.8°
2034-01-09 Mon	41	—	unknown	18:50–20:25 (good, 1.58 h)	87.2° 14:05	11.34	74%	123.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-12-11&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.