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 Triangulum Pinwheel: 12-18 (100), 12-19 (100), 12-20 (100), 12-21 (100), 12-22 (100) — by astronomy; check the weather when the night is within four days.

2032-12-13astronomy score per night — click a bar for that night2033-01-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-13 Mon	27	—	unknown	18:35–01:45 (marginal, 7.17 h)	79.1° 20:25	11.48	90%	24.2°
2032-12-14 Tue	27	—	unknown	18:35–21:50 (marginal, 3.25 h)	79.1° 20:20	11.49	96%	33.9°
2032-12-15 Wed	38	—	unknown	18:35–00:50 (marginal, 6.25 h)	79.1° 20:15	11.49	99%	45.3°
2032-12-16 Thu	55	—	unknown	18:35–18:50 (good, 0.25 h)	79.1° 20:15	11.5	100%	57.2°
2032-12-17 Fri	71	—	unknown	18:35–21:10 (good, 2.58 h)	79.1° 20:10	11.5	99%	69.3°
2032-12-18 Sat	100	—	unknown	18:35–23:20 (good, 4.75 h)	79.1° 20:05	11.5	95%	81.2°
2032-12-19 Sun	100	—	unknown	18:35–00:35 (good, 6.0 h)	79.1° 20:00	11.51	90%	92.9°
2032-12-20 Mon	100	—	unknown	18:35–01:10 (good, 6.58 h)	79.1° 19:55	11.51	84%	104.4°
2032-12-21 Tue	100	—	unknown	18:35–01:15 (good, 6.67 h)	79.1° 19:55	11.51	76%	115.6°
2032-12-22 Wed	100	—	unknown	18:35–01:15 (good, 6.67 h)	79.1° 19:50	11.51	68%	126.5°
2032-12-23 Thu	100	—	unknown	18:40–01:10 (good, 6.5 h)	79.1° 19:45	11.5	59%	137.1°
2032-12-24 Fri	100	—	unknown	18:40–01:10 (good, 6.5 h)	79.1° 19:40	11.5	49%	146.9°
2032-12-25 Sat	100	—	unknown	18:40–01:10 (good, 6.5 h)	79.1° 19:40	11.5	40%	155.3°
2032-12-26 Sun	100	—	unknown	18:40–01:05 (good, 6.42 h)	79.1° 19:35	11.49	31%	160.0°
2032-12-27 Mon	100	—	unknown	18:40–01:00 (good, 6.33 h)	79.1° 19:30	11.49	22%	158.2°
2032-12-28 Tue	100	—	unknown	18:40–01:00 (good, 6.33 h)	79.1° 19:25	11.48	14%	150.6°
2032-12-29 Wed	100	—	unknown	18:40–00:55 (good, 6.25 h)	79.1° 19:20	11.47	8%	140.1°
2032-12-30 Thu	100	—	unknown	18:40–00:50 (good, 6.17 h)	79.1° 19:20	11.47	3%	128.1°
2032-12-31 Fri	100	—	unknown	18:45–00:45 (good, 6.0 h)	79.1° 19:15	11.46	0%	115.4°
2033-01-01 Sat	100	—	unknown	18:45–00:40 (good, 5.92 h)	79.1° 19:10	11.45	0%	102.1°
2033-01-02 Sun	100	—	unknown	18:45–00:40 (good, 5.92 h)	79.1° 19:05	11.44	3%	88.5°
2033-01-03 Mon	100	—	unknown	18:45–00:35 (good, 5.83 h)	79.1° 19:00	11.42	9%	74.8°
2033-01-04 Tue	100	—	unknown	18:45–00:30 (good, 5.75 h)	79.1° 19:00	11.41	16%	61.3°
2033-01-05 Wed	94	—	unknown	18:45–00:25 (good, 5.67 h)	79.1° 18:55	11.4	26%	48.1°
2033-01-06 Thu	85	—	unknown	18:50–00:25 (good, 5.58 h)	79.1° 18:50	11.38	36%	35.8°
2033-01-07 Fri	70	—	unknown	18:50–23:55 (good, 5.08 h)	79.1° 18:45	11.37	48%	25.5°
2033-01-08 Sat	51	—	unknown	18:50–00:40 (marginal, 5.83 h)	79.1° 18:45	11.35	59%	20.0°
2033-01-09 Sun	35	—	unknown	18:50–00:25 (marginal, 5.58 h)	79.1° 18:40	11.34	69%	22.7°
2033-01-10 Mon	25	—	unknown	18:50–00:05 (marginal, 5.25 h)	79.1° 18:35	11.32	79%	31.3°
2033-01-11 Tue	26	—	unknown	18:55–23:55 (marginal, 5.0 h)	79.1° 18:30	11.3	87%	42.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-13&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.