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: 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100), 11-21 (100) — by astronomy; check the weather when the night is within four days.

2036-11-17astronomy score per night — click a bar for that night2036-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-11-17 Mon	100	—	unknown	18:40–23:50 (good, 5.17 h)	87.2° 17:30	11.03	0%	93.5°
2036-11-18 Tue	100	—	unknown	18:35–23:50 (good, 5.25 h)	87.2° 17:30	11.06	1%	86.8°
2036-11-19 Wed	100	—	unknown	18:35–23:45 (good, 5.17 h)	87.2° 17:25	11.08	4%	80.4°
2036-11-20 Thu	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.2° 17:20	11.11	9%	74.5°
2036-11-21 Fri	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.13	15%	69.3°
2036-11-22 Sat	94	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:10	11.16	23%	65.1°
2036-11-23 Sun	88	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.18	32%	62.0°
2036-11-24 Mon	83	—	unknown	18:35–23:25 (good, 4.83 h)	87.2° 17:05	11.2	40%	60.1°
2036-11-25 Tue	77	—	unknown	18:35–23:00 (good, 4.42 h)	87.2° 17:00	11.23	50%	59.7°
2036-11-26 Wed	65	—	unknown	18:35–22:50 (good, 4.25 h)	87.2° 16:55	11.25	59%	60.7°
2036-11-27 Thu	57	—	unknown	18:35–21:35 (good, 3.0 h)	87.2° 16:55	11.27	68%	63.1°
2036-11-28 Fri	51	—	unknown	18:35–20:30 (good, 1.92 h)	87.2° 16:50	11.29	77%	66.7°
2036-11-29 Sat	48	—	unknown	18:35–20:05 (good, 1.5 h)	87.2° 16:45	11.31	85%	71.5°
2036-11-30 Sun	49	—	unknown	18:35–20:10 (good, 1.58 h)	87.2° 16:40	11.32	92%	77.1°
2036-12-01 Mon	52	—	unknown	18:35–20:30 (good, 1.92 h)	87.2° 16:35	11.34	96%	83.5°
2036-12-02 Tue	59	—	unknown	18:35–21:05 (good, 2.5 h)	87.2° 16:35	11.36	99%	90.4°
2036-12-03 Wed	67	—	unknown	18:35–21:45 (good, 3.17 h)	87.2° 16:30	11.37	100%	97.3°
2036-12-04 Thu	76	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 16:25	11.39	98%	104.1°
2036-12-05 Fri	95	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:20	11.4	93%	110.2°
2036-12-06 Sat	100	—	unknown	18:35–22:25 (good, 3.83 h)	87.2° 16:15	11.41	86%	115.2°
2036-12-07 Sun	100	—	unknown	18:35–22:25 (good, 3.83 h)	87.2° 16:15	11.43	77%	118.6°
2036-12-08 Mon	100	—	unknown	18:35–22:25 (good, 3.83 h)	87.2° 16:10	11.44	66%	120.2°
2036-12-09 Tue	100	—	unknown	18:35–22:25 (good, 3.83 h)	87.2° 16:05	11.45	55%	119.6°
2036-12-10 Wed	99	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.46	44%	117.2°
2036-12-11 Thu	98	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.47	33%	113.2°
2036-12-12 Fri	96	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 15:55	11.48	23%	108.0°
2036-12-13 Sat	94	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 15:50	11.48	15%	101.9°
2036-12-14 Sun	92	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	8%	95.5°
2036-12-15 Mon	90	—	unknown	18:35–22:00 (good, 3.42 h)	87.2° 15:40	11.49	3%	88.9°
2036-12-16 Tue	89	—	unknown	18:35–22:00 (good, 3.42 h)	87.2° 15:40	11.5	1%	82.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-11-17&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.