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 Seven Sisters: 10-31 (100), 11-01 (100), 11-02 (100), 11-03 (100), 11-04 (100) — by astronomy; check the weather when the night is within four days.

2035-10-31astronomy score per night — click a bar for that night2035-11-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-10-31 Wed	100	—	unknown	20:25–05:20 (good, 8.92 h)	72.5° 01:30	10.46	1%	164.9°
2035-11-01 Thu	100	—	unknown	20:20–05:20 (good, 9.0 h)	72.5° 01:25	10.49	3%	170.9°
2035-11-02 Fri	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.5° 01:20	10.53	8%	164.6°
2035-11-03 Sat	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.5° 01:15	10.57	14%	153.9°
2035-11-04 Sun	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.5° 01:15	10.6	21%	142.6°
2035-11-05 Mon	100	—	unknown	20:05–05:25 (good, 9.33 h)	72.5° 01:10	10.64	29%	131.1°
2035-11-06 Tue	100	—	unknown	20:05–05:30 (good, 9.42 h)	72.5° 01:05	10.67	38%	119.5°
2035-11-07 Wed	100	—	unknown	20:05–05:30 (good, 9.42 h)	72.5° 01:00	10.7	47%	107.8°
2035-11-08 Thu	100	—	unknown	20:05–05:30 (good, 9.42 h)	72.5° 01:00	10.74	56%	95.9°
2035-11-09 Fri	100	—	unknown	20:10–05:30 (good, 9.33 h)	72.5° 00:55	10.77	66%	83.7°
2035-11-10 Sat	100	—	unknown	21:10–05:30 (good, 8.33 h)	72.5° 00:50	10.8	75%	71.2°
2035-11-11 Sun	98	—	unknown	23:20–05:35 (good, 6.25 h)	72.5° 00:45	10.83	84%	58.4°
2035-11-12 Mon	89	—	unknown	02:50–05:35 (good, 2.75 h)	72.5° 00:40	10.86	91%	45.2°
2035-11-13 Tue	80	—	unknown	05:20–05:35 (good, 0.25 h)	72.5° 00:40	10.89	96%	31.8°
2035-11-14 Wed	34	—	unknown	01:40–05:35 (marginal, 3.92 h)	72.5° 00:35	10.92	99%	18.6°
2035-11-15 Thu	27	—	unknown	19:35–21:45 (marginal, 2.17 h)	72.5° 00:30	10.95	100%	9.3°
2035-11-16 Fri	34	—	unknown	19:15–23:20 (marginal, 4.08 h)	72.5° 00:25	10.98	97%	16.0°
2035-11-17 Sat	52	—	unknown	18:50–01:35 (marginal, 6.75 h)	72.5° 00:20	11.01	92%	29.4°
2035-11-18 Sun	83	—	unknown	19:15–20:10 (good, 0.92 h)	72.5° 00:20	11.04	84%	43.6°
2035-11-19 Mon	92	—	unknown	19:10–02:05 (good, 6.92 h)	72.5° 00:15	11.06	75%	57.9°
2035-11-20 Tue	100	—	unknown	19:05–04:10 (good, 9.08 h)	72.5° 00:10	11.09	64%	72.0°
2035-11-21 Wed	100	—	unknown	19:00–05:00 (good, 10.0 h)	72.5° 00:05	11.11	53%	85.9°
2035-11-22 Thu	100	—	unknown	18:55–05:05 (good, 10.17 h)	72.5° 00:05	11.14	42%	99.5°
2035-11-23 Fri	100	—	unknown	18:55–05:05 (good, 10.17 h)	72.5° 00:00	11.16	32%	112.7°
2035-11-24 Sat	100	—	unknown	18:50–05:05 (good, 10.25 h)	72.5° 23:55	11.19	22%	125.6°
2035-11-25 Sun	100	—	unknown	18:45–05:00 (good, 10.25 h)	72.5° 23:50	11.21	15%	138.3°
2035-11-26 Mon	100	—	unknown	18:40–04:55 (good, 10.25 h)	72.5° 23:45	11.23	8%	150.5°
2035-11-27 Tue	100	—	unknown	18:35–04:55 (good, 10.33 h)	72.5° 23:45	11.25	4%	161.9°
2035-11-28 Wed	100	—	unknown	18:35–04:50 (good, 10.25 h)	72.5° 23:40	11.27	1%	170.3°
2035-11-29 Thu	100	—	unknown	18:35–04:45 (good, 10.17 h)	72.5° 23:35	11.29	0%	167.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-10-31&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.