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: 11-13 (100), 11-14 (100), 11-15 (100), 11-16 (100), 11-17 (100) — by astronomy; check the weather when the night is within four days.

2034-11-13astronomy score per night — click a bar for that night2034-12-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-13 Mon	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:25	10.9	7%	125.5°
2034-11-14 Tue	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:20	10.93	13%	114.9°
2034-11-15 Wed	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.1° 22:15	10.96	20%	104.0°
2034-11-16 Thu	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.1° 22:15	10.99	28%	92.9°
2034-11-17 Fri	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.1° 22:10	11.02	38%	81.5°
2034-11-18 Sat	100	—	unknown	18:40–03:35 (good, 8.92 h)	79.1° 22:05	11.04	47%	69.9°
2034-11-19 Sun	99	—	unknown	18:35–03:35 (good, 9.0 h)	79.1° 22:00	11.07	58%	58.2°
2034-11-20 Mon	91	—	unknown	19:30–03:30 (good, 8.0 h)	79.1° 21:55	11.1	68%	46.5°
2034-11-21 Tue	82	—	unknown	02:40–03:25 (good, 0.75 h)	79.1° 21:55	11.12	78%	35.4°
2034-11-22 Wed	47	—	unknown	18:35–03:40 (marginal, 9.08 h)	79.1° 21:50	11.15	87%	26.2°
2034-11-23 Thu	32	—	unknown	18:35–03:20 (marginal, 8.75 h)	79.1° 21:45	11.17	94%	22.7°
2034-11-24 Fri	30	—	unknown	18:35–21:15 (marginal, 2.67 h)	79.1° 21:40	11.19	98%	27.8°
2034-11-25 Sat	40	—	unknown	18:35–23:45 (marginal, 5.17 h)	79.1° 21:40	11.21	100%	38.3°
2034-11-26 Sun	61	—	unknown	18:35–19:20 (good, 0.75 h)	79.1° 21:35	11.24	98%	51.0°
2034-11-27 Mon	98	—	unknown	18:35–22:00 (good, 3.42 h)	79.1° 21:30	11.26	94%	64.5°
2034-11-28 Tue	100	—	unknown	18:35–00:45 (good, 6.17 h)	79.1° 21:25	11.28	87%	78.0°
2034-11-29 Wed	100	—	unknown	18:35–02:20 (good, 7.75 h)	79.1° 21:20	11.3	78%	91.2°
2034-11-30 Thu	100	—	unknown	18:35–02:35 (good, 8.0 h)	79.1° 21:20	11.31	68%	104.0°
2034-12-01 Fri	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.1° 21:15	11.33	58%	116.2°
2034-12-02 Sat	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.1° 21:10	11.35	48%	127.8°
2034-12-03 Sun	100	—	unknown	18:35–02:35 (good, 8.0 h)	79.1° 21:05	11.36	38%	138.5°
2034-12-04 Mon	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.1° 21:00	11.38	28%	147.8°
2034-12-05 Tue	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.1° 21:00	11.39	20%	154.7°
2034-12-06 Wed	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.1° 20:55	11.41	13%	157.2°
2034-12-07 Thu	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.1° 20:50	11.42	8%	154.2°
2034-12-08 Fri	100	—	unknown	18:35–02:20 (good, 7.75 h)	79.1° 20:45	11.43	3%	147.2°
2034-12-09 Sat	100	—	unknown	18:35–02:15 (good, 7.67 h)	79.1° 20:45	11.44	1%	138.1°
2034-12-10 Sun	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.1° 20:40	11.45	0%	128.1°
2034-12-11 Mon	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.1° 20:35	11.46	1%	117.6°
2034-12-12 Tue	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.1° 20:30	11.47	4%	106.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-13&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.