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 Andromeda Galaxy: 12-08 (100), 12-09 (100), 12-10 (100), 12-11 (100), 12-12 (100) — by astronomy; check the weather when the night is within four days.

2033-11-29astronomy score per night — click a bar for that night2033-12-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-29 Tue	92	—	unknown	18:35–02:40 (good, 8.08 h)	89.8° 20:30	11.3	53%	53.0°
2033-11-30 Wed	84	—	unknown	18:35–02:35 (good, 8.0 h)	89.7° 20:25	11.32	64%	44.0°
2033-12-01 Thu	59	—	unknown	18:35–03:05 (marginal, 8.5 h)	89.6° 20:20	11.34	75%	37.3°
2033-12-02 Fri	43	—	unknown	18:35–02:45 (marginal, 8.17 h)	89.6° 20:20	11.35	84%	34.7°
2033-12-03 Sat	36	—	unknown	18:35–02:25 (marginal, 7.83 h)	89.7° 20:15	11.37	92%	37.4°
2033-12-04 Sun	39	—	unknown	18:35–02:05 (marginal, 7.5 h)	89.8° 20:10	11.38	97%	44.4°
2033-12-05 Mon	52	—	unknown	18:35–02:00 (marginal, 7.42 h)	89.7° 20:05	11.4	100%	54.0°
2033-12-06 Tue	67	—	unknown	18:35–20:10 (good, 1.58 h)	89.5° 20:00	11.41	99%	64.9°
2033-12-07 Wed	77	—	unknown	18:35–22:55 (good, 4.33 h)	89.6° 20:00	11.42	96%	76.3°
2033-12-08 Thu	100	—	unknown	18:35–00:25 (good, 5.83 h)	89.7° 19:55	11.44	91%	87.7°
2033-12-09 Fri	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.7° 19:50	11.45	84%	98.7°
2033-12-10 Sat	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.6° 19:45	11.46	76%	109.2°
2033-12-11 Sun	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.5° 19:45	11.47	66%	119.1°
2033-12-12 Mon	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.7° 19:40	11.47	57%	128.0°
2033-12-13 Tue	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.8° 19:35	11.48	47%	135.7°
2033-12-14 Wed	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.7° 19:30	11.49	38%	141.6°
2033-12-15 Thu	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.6° 19:25	11.49	29%	144.8°
2033-12-16 Fri	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.6° 19:25	11.5	21%	144.7°
2033-12-17 Sat	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.7° 19:20	11.5	14%	141.3°
2033-12-18 Sun	100	—	unknown	18:35–01:25 (good, 6.83 h)	89.8° 19:15	11.5	8%	135.2°
2033-12-19 Mon	100	—	unknown	18:35–01:20 (good, 6.75 h)	89.7° 19:10	11.51	4%	127.3°
2033-12-20 Tue	100	—	unknown	18:35–01:15 (good, 6.67 h)	89.5° 19:05	11.51	1%	118.2°
2033-12-21 Wed	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.6° 19:05	11.51	0%	108.3°
2033-12-22 Thu	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 19:00	11.51	2%	97.9°
2033-12-23 Fri	100	—	unknown	18:40–01:05 (good, 6.42 h)	89.7° 18:55	11.5	5%	87.1°
2033-12-24 Sat	100	—	unknown	18:40–01:00 (good, 6.33 h)	89.6° 18:50	11.5	11%	76.3°
2033-12-25 Sun	100	—	unknown	18:40–00:55 (good, 6.25 h)	89.5° 18:50	11.5	18%	65.5°
2033-12-26 Mon	95	—	unknown	18:40–00:50 (good, 6.17 h)	89.7° 18:45	11.49	28%	55.3°
2033-12-27 Tue	87	—	unknown	18:40–00:50 (good, 6.17 h)	89.8° 18:40	11.49	38%	46.1°
2033-12-28 Wed	74	—	unknown	18:40–00:45 (good, 6.08 h)	89.7° 18:35	11.48	49%	38.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-29&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.