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: 01-06 (100), 01-07 (100), 01-08 (100), 01-09 (100), 01-10 (100) — by astronomy; check the weather when the night is within four days.

2033-12-30astronomy score per night — click a bar for that night2034-01-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-12-30 Fri	41	—	unknown	18:40–01:10 (marginal, 6.5 h)	79.1° 19:20	11.47	71%	21.7°
2033-12-31 Sat	28	—	unknown	18:45–00:50 (marginal, 6.08 h)	79.1° 19:15	11.46	81%	27.5°
2034-01-01 Sun	26	—	unknown	18:45–00:30 (marginal, 5.75 h)	79.1° 19:10	11.45	89%	37.9°
2034-01-02 Mon	33	—	unknown	18:45–00:25 (marginal, 5.67 h)	79.1° 19:05	11.44	95%	50.0°
2034-01-03 Tue	46	—	unknown	18:45–00:30 (marginal, 5.75 h)	79.1° 19:05	11.43	99%	62.7°
2034-01-04 Wed	63	—	unknown	18:45–21:20 (good, 2.58 h)	79.1° 19:00	11.41	100%	75.6°
2034-01-05 Thu	79	—	unknown	18:45–22:45 (good, 4.0 h)	79.1° 18:55	11.4	98%	88.3°
2034-01-06 Fri	100	—	unknown	18:50–23:55 (good, 5.08 h)	79.1° 18:50	11.39	95%	100.7°
2034-01-07 Sat	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:50	11.37	89%	112.7°
2034-01-08 Sun	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:45	11.36	82%	124.2°
2034-01-09 Mon	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:40	11.34	74%	135.0°
2034-01-10 Tue	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:35	11.32	65%	144.9°
2034-01-11 Wed	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:30	11.3	56%	153.1°
2034-01-12 Thu	100	—	unknown	18:55–00:00 (good, 5.08 h)	79.1° 18:30	11.29	46%	157.9°
2034-01-13 Fri	100	—	unknown	18:55–23:55 (good, 5.0 h)	79.1° 18:25	11.27	37%	157.3°
2034-01-14 Sat	100	—	unknown	18:55–23:50 (good, 4.92 h)	79.1° 18:20	11.24	28%	151.4°
2034-01-15 Sun	100	—	unknown	18:55–23:50 (good, 4.92 h)	79.1° 18:15	11.22	20%	142.6°
2034-01-16 Mon	100	—	unknown	18:55–23:45 (good, 4.83 h)	79.1° 18:10	11.2	13%	132.3°
2034-01-17 Tue	100	—	unknown	19:00–23:40 (good, 4.67 h)	79.1° 18:10	11.18	7%	121.1°
2034-01-18 Wed	100	—	unknown	19:00–23:35 (good, 4.58 h)	79.1° 18:05	11.16	3%	109.3°
2034-01-19 Thu	100	—	unknown	19:00–23:35 (good, 4.58 h)	79.1° 18:00	11.13	0%	97.1°
2034-01-20 Fri	100	—	unknown	19:00–23:30 (good, 4.5 h)	79.1° 17:55	11.11	0%	84.6°
2034-01-21 Sat	100	—	unknown	19:00–23:25 (good, 4.42 h)	79.1° 17:50	11.08	3%	71.8°
2034-01-22 Sun	100	—	unknown	19:05–23:20 (good, 4.25 h)	79.1° 17:50	11.05	8%	59.1°
2034-01-23 Mon	94	—	unknown	19:05–23:15 (good, 4.17 h)	79.1° 17:45	11.03	15%	46.6°
2034-01-24 Tue	85	—	unknown	19:05–23:15 (good, 4.17 h)	79.1° 17:40	11.0	24%	35.0°
2034-01-25 Wed	68	—	unknown	19:05–22:55 (good, 3.83 h)	79.1° 17:35	10.97	34%	25.7°
2034-01-26 Thu	51	—	unknown	19:10–22:40 (good, 3.5 h)	79.1° 17:35	10.94	45%	21.7°
2034-01-27 Fri	36	—	unknown	19:10–23:25 (marginal, 4.25 h)	79.1° 17:30	10.91	57%	25.8°
2034-01-28 Sat	27	—	unknown	19:10–23:10 (marginal, 4.0 h)	79.1° 17:25	10.88	68%	35.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-12-30&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.