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 HD 189733: 11-22 (72), 11-23 (70), 11-24 (68), 11-25 (66), 11-26 (64) — by astronomy; check the weather when the night is within four days.

2032-11-22astronomy score per night — click a bar for that night2032-12-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-22 Mon	72	—	unknown	18:35–21:20 (good, 2.75 h)	71.1° 16:15	11.16	69%	143.0°
2032-11-23 Tue	70	—	unknown	18:35–21:15 (good, 2.67 h)	71.1° 16:10	11.18	60%	141.1°
2032-11-24 Wed	68	—	unknown	18:35–21:15 (good, 2.67 h)	71.1° 16:05	11.2	50%	136.5°
2032-11-25 Thu	66	—	unknown	18:35–21:10 (good, 2.58 h)	71.1° 16:05	11.22	41%	129.9°
2032-11-26 Fri	64	—	unknown	18:35–21:05 (good, 2.5 h)	71.1° 16:00	11.25	32%	122.0°
2032-11-27 Sat	63	—	unknown	18:35–21:00 (good, 2.42 h)	71.1° 15:55	11.27	23%	113.3°
2032-11-28 Sun	61	—	unknown	18:35–20:55 (good, 2.33 h)	71.1° 15:50	11.29	16%	103.9°
2032-11-29 Mon	59	—	unknown	18:35–20:55 (good, 2.33 h)	71.1° 15:45	11.3	9%	94.0°
2032-11-30 Tue	57	—	unknown	18:35–20:50 (good, 2.25 h)	71.1° 15:45	11.32	4%	83.9°
2032-12-01 Wed	56	—	unknown	18:35–20:45 (good, 2.17 h)	71.1° 15:40	11.34	1%	73.7°
2032-12-02 Thu	54	—	unknown	18:35–20:40 (good, 2.08 h)	71.1° 15:35	11.36	0%	63.5°
2032-12-03 Fri	52	—	unknown	18:35–20:40 (good, 2.08 h)	71.1° 15:30	11.37	2%	53.9°
2032-12-04 Sat	50	—	unknown	18:35–20:35 (good, 2.0 h)	71.1° 15:30	11.39	5%	45.6°
2032-12-05 Sun	45	—	unknown	18:35–20:30 (good, 1.92 h)	71.1° 15:25	11.4	11%	39.5°
2032-12-06 Mon	39	—	unknown	18:35–20:20 (good, 1.75 h)	71.1° 15:20	11.41	20%	37.1°
2032-12-07 Tue	33	—	unknown	18:35–20:10 (good, 1.58 h)	71.1° 15:15	11.43	29%	39.2°
2032-12-08 Wed	27	—	unknown	18:35–19:55 (good, 1.33 h)	71.1° 15:10	11.44	40%	45.1°
2032-12-09 Thu	22	—	unknown	18:35–19:25 (good, 0.83 h)	71.1° 15:10	11.45	52%	53.6°
2032-12-10 Fri	19	—	unknown	18:35–18:45 (good, 0.17 h)	71.1° 15:05	11.46	63%	63.5°
2032-12-11 Sat	18	—	unknown	18:00–20:30 (marginal, 2.5 h)	71.1° 15:00	11.47	73%	74.2°
2032-12-12 Sun	19	—	unknown	18:35–18:50 (good, 0.25 h)	71.1° 14:55	11.48	82%	85.2°
2032-12-13 Mon	20	—	unknown	18:35–19:20 (good, 0.75 h)	71.1° 14:50	11.48	90%	96.2°
2032-12-14 Tue	22	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:50	11.49	96%	107.0°
2032-12-15 Wed	25	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:45	11.49	99%	117.2°
2032-12-16 Thu	26	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:40	11.5	100%	126.5°
2032-12-17 Fri	25	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:35	11.5	99%	134.3°
2032-12-18 Sat	28	—	unknown	18:35–19:30 (good, 0.92 h)	71.1° 14:30	11.5	95%	140.0°
2032-12-19 Sun	27	—	unknown	18:35–19:35 (good, 1.0 h)	71.1° 14:30	11.51	90%	142.7°
2032-12-20 Mon	26	—	unknown	18:35–19:30 (good, 0.92 h)	71.1° 14:25	11.51	84%	141.9°
2032-12-21 Tue	24	—	unknown	18:35–19:25 (good, 0.83 h)	71.1° 14:20	11.51	76%	138.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-11-22&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.