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: 01-12 (100), 01-13 (100), 01-14 (100), 01-15 (100), 01-16 (100) — by astronomy; check the weather when the night is within four days.

2034-01-12astronomy score per night — click a bar for that night2034-02-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2034-01-29 Sun	25	—	unknown	19:10–23:00 (marginal, 3.83 h)	79.1° 17:20	10.85	78%	46.6°
2034-01-30 Mon	27	—	unknown	19:10–22:55 (marginal, 3.75 h)	79.1° 17:15	10.82	86%	58.8°
2034-01-31 Tue	32	—	unknown	18:40–22:55 (marginal, 4.25 h)	79.1° 17:15	10.79	93%	71.3°
2034-02-01 Wed	40	—	unknown	19:15–20:30 (good, 1.25 h)	79.1° 17:10	10.76	97%	83.8°
2034-02-02 Thu	50	—	unknown	19:15–21:35 (good, 2.33 h)	79.1° 17:05	10.72	100%	96.2°
2034-02-03 Fri	61	—	unknown	19:15–22:10 (good, 2.92 h)	79.1° 17:00	10.69	100%	108.3°
2034-02-04 Sat	70	—	unknown	19:20–22:20 (good, 3.0 h)	79.1° 16:55	10.65	98%	120.0°
2034-02-05 Sun	77	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:55	10.62	94%	131.1°
2034-02-06 Mon	77	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:50	10.58	88%	141.5°
2034-02-07 Tue	76	—	unknown	19:20–22:10 (good, 2.83 h)	79.1° 16:45	10.55	81%	150.4°
2034-02-08 Wed	75	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:40	10.51	73%	156.6°
2034-02-09 Thu	71	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:40	10.47	64%	157.9°
2034-02-10 Fri	69	—	unknown	19:25–22:05 (good, 2.67 h)	79.1° 16:35	10.44	55%	153.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-01-12&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.