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: 12-04 (50), 12-05 (45), 12-06 (39), 12-07 (33), 12-18 (28) — by astronomy; check the weather when the night is within four days.

2032-12-04astronomy score per night — click a bar for that night2033-01-02

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-12-22 Wed	23	—	unknown	18:35–19:25 (good, 0.83 h)	71.1° 14:15	11.51	68%	132.1°
2032-12-23 Thu	21	—	unknown	18:40–19:20 (good, 0.67 h)	71.1° 14:15	11.5	59%	124.6°
2032-12-24 Fri	19	—	unknown	18:40–19:15 (good, 0.58 h)	71.1° 14:10	11.5	49%	116.2°
2032-12-25 Sat	19	—	unknown	18:40–19:10 (good, 0.5 h)	71.1° 14:05	11.5	40%	107.1°
2032-12-26 Sun	17	—	unknown	18:40–19:05 (good, 0.42 h)	71.1° 14:00	11.49	31%	97.6°
2032-12-27 Mon	15	—	unknown	18:40–19:05 (good, 0.42 h)	71.1° 13:55	11.49	22%	87.7°
2032-12-28 Tue	13	—	unknown	18:40–19:00 (good, 0.33 h)	71.1° 13:55	11.48	14%	77.5°
2032-12-29 Wed	12	—	unknown	18:40–18:55 (good, 0.25 h)	71.1° 13:50	11.47	8%	67.4°
2032-12-30 Thu	10	—	unknown	18:40–18:50 (good, 0.17 h)	71.1° 13:45	11.47	3%	57.5°
2032-12-31 Fri	8	—	unknown	18:45–18:50 (good, 0.08 h)	71.1° 13:40	11.46	0%	48.5°
2033-01-01 Sat	7	—	unknown	18:10–19:10 (marginal, 1.0 h)	71.1° 13:35	11.45	0%	41.3°
2033-01-02 Sun	6	—	unknown	18:10–18:40 (marginal, 0.5 h)	71.1° 13:35	11.44	3%	37.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-04&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.