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: 09-02 (100), 09-03 (100), 09-04 (100), 09-05 (100), 09-06 (100) — by astronomy; check the weather when the night is within four days.

2032-09-02astronomy score per night — click a bar for that night2032-10-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-02 Thu	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:30	7.7	4%	125.2°
2032-09-03 Fri	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:25	7.75	1%	126.6°
2032-09-04 Sat	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.2° 23:25	7.81	0%	126.2°
2032-09-05 Sun	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.2° 23:20	7.86	1%	124.1°
2032-09-06 Mon	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.2° 23:15	7.92	4%	120.3°
2032-09-07 Tue	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.2° 23:10	7.97	8%	115.3°
2032-09-08 Wed	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.2° 23:05	8.03	14%	109.3°
2032-09-09 Thu	100	—	unknown	21:20–05:25 (good, 8.08 h)	87.2° 23:05	8.08	22%	102.4°
2032-09-10 Fri	100	—	unknown	21:15–05:20 (good, 8.08 h)	87.2° 23:00	8.14	31%	95.1°
2032-09-11 Sat	100	—	unknown	21:15–05:15 (good, 8.0 h)	87.2° 22:55	8.19	41%	87.4°
2032-09-12 Sun	100	—	unknown	21:10–05:10 (good, 8.0 h)	87.2° 22:50	8.24	52%	79.6°
2032-09-13 Mon	100	—	unknown	21:10–05:10 (good, 8.0 h)	87.2° 22:50	8.3	62%	72.0°
2032-09-14 Tue	96	—	unknown	21:10–05:05 (good, 7.92 h)	87.2° 22:45	8.35	73%	64.9°
2032-09-15 Wed	87	—	unknown	21:05–05:00 (good, 7.92 h)	87.2° 22:40	8.4	83%	58.9°
2032-09-16 Thu	77	—	unknown	04:25–04:55 (good, 0.5 h)	87.2° 22:35	8.45	91%	54.8°
2032-09-17 Fri	54	—	unknown	21:05–05:20 (marginal, 8.25 h)	87.2° 22:30	8.51	97%	53.3°
2032-09-18 Sat	56	—	unknown	21:00–05:05 (marginal, 8.08 h)	87.2° 22:30	8.56	100%	54.7°
2032-09-19 Sun	61	—	unknown	21:00–21:15 (good, 0.25 h)	87.2° 22:25	8.61	100%	58.8°
2032-09-20 Mon	68	—	unknown	20:55–22:45 (good, 1.83 h)	87.2° 22:20	8.66	97%	64.9°
2032-09-21 Tue	76	—	unknown	20:55–01:10 (good, 4.25 h)	87.2° 22:15	8.71	91%	72.3°
2032-09-22 Wed	100	—	unknown	20:55–02:25 (good, 5.5 h)	87.2° 22:10	8.76	83%	80.3°
2032-09-23 Thu	100	—	unknown	20:50–03:40 (good, 6.83 h)	87.2° 22:10	8.81	74%	88.4°
2032-09-24 Fri	100	—	unknown	20:50–04:00 (good, 7.17 h)	87.2° 22:05	8.86	65%	96.2°
2032-09-25 Sat	100	—	unknown	20:50–04:05 (good, 7.25 h)	87.2° 22:00	8.91	55%	103.7°
2032-09-26 Sun	100	—	unknown	20:45–04:10 (good, 7.42 h)	87.2° 21:55	8.96	45%	110.4°
2032-09-27 Mon	100	—	unknown	20:45–04:10 (good, 7.42 h)	87.2° 21:55	9.01	35%	116.3°
2032-09-28 Tue	100	—	unknown	20:40–04:05 (good, 7.42 h)	87.2° 21:50	9.06	26%	121.1°
2032-09-29 Wed	100	—	unknown	20:40–04:05 (good, 7.42 h)	87.2° 21:45	9.11	18%	124.6°
2032-09-30 Thu	100	—	unknown	20:40–04:00 (good, 7.33 h)	87.2° 21:40	9.16	12%	126.4°
2032-10-01 Fri	100	—	unknown	20:35–03:55 (good, 7.33 h)	87.2° 21:35	9.21	6%	126.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-02&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.