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 Vega: 11-09 (76), 11-10 (74), 11-11 (74), 11-12 (72), 11-13 (70) — by astronomy; check the weather when the night is within four days.

2036-11-09astronomy score per night — click a bar for that night2036-12-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-11-09 Sun	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.79	63%	117.5°
2036-11-10 Mon	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:40	10.83	52%	113.2°
2036-11-11 Tue	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.86	40%	107.6°
2036-11-12 Wed	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.89	29%	101.1°
2036-11-13 Thu	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.92	20%	94.1°
2036-11-14 Fri	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.95	12%	86.9°
2036-11-15 Sat	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.98	5%	79.9°
2036-11-16 Sun	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.0	2%	73.5°
2036-11-17 Mon	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.03	0%	67.9°
2036-11-18 Tue	63	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.06	1%	63.5°
2036-11-19 Wed	61	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:05	11.08	4%	60.6°
2036-11-20 Thu	57	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.11	9%	59.3°
2036-11-21 Fri	53	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.13	15%	59.7°
2036-11-22 Sat	48	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:50	11.16	23%	61.5°
2036-11-23 Sun	43	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:45	11.18	32%	64.6°
2036-11-24 Mon	38	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:45	11.2	40%	68.8°
2036-11-25 Tue	34	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:40	11.23	50%	73.7°
2036-11-26 Wed	31	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:35	11.25	59%	79.2°
2036-11-27 Thu	29	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:30	11.27	68%	85.2°
2036-11-28 Fri	28	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:25	11.29	77%	91.5°
2036-11-29 Sat	28	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:25	11.31	85%	97.8°
2036-11-30 Sun	28	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:20	11.32	92%	104.0°
2036-12-01 Mon	29	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:15	11.34	96%	109.8°
2036-12-02 Tue	30	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.36	99%	114.8°
2036-12-03 Wed	31	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.37	100%	118.5°
2036-12-04 Thu	32	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:05	11.39	98%	120.5°
2036-12-05 Fri	35	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:00	11.4	93%	120.4°
2036-12-06 Sat	34	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.41	86%	118.2°
2036-12-07 Sun	34	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	77%	114.2°
2036-12-08 Mon	32	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:50	11.44	66%	108.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-11-09&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.