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: 10-02 (100), 10-03 (100), 10-04 (100), 10-05 (100), 10-06 (100) — by astronomy; check the weather when the night is within four days.

2035-10-02astronomy score per night — click a bar for that night2035-10-31

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-10-02 Tue	100	—	unknown	20:45–05:50 (good, 9.08 h)	79.1° 02:10	9.22	2%	155.6°
2035-10-03 Wed	100	—	unknown	20:40–05:50 (good, 9.17 h)	79.1° 02:05	9.27	6%	155.2°
2035-10-04 Thu	100	—	unknown	20:35–05:50 (good, 9.25 h)	79.1° 02:05	9.31	12%	149.5°
2035-10-05 Fri	100	—	unknown	20:35–05:55 (good, 9.33 h)	79.1° 02:00	9.36	19%	140.9°
2035-10-06 Sat	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:55	9.41	27%	131.1°
2035-10-07 Sun	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:50	9.45	36%	120.7°
2035-10-08 Mon	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.1° 01:45	9.5	45%	110.2°
2035-10-09 Tue	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:45	9.55	55%	99.4°
2035-10-10 Wed	100	—	unknown	20:30–06:00 (good, 9.5 h)	79.1° 01:40	9.59	64%	88.5°
2035-10-11 Thu	100	—	unknown	20:45–06:00 (good, 9.25 h)	79.1° 01:35	9.64	73%	77.4°
2035-10-12 Fri	100	—	unknown	22:10–06:00 (good, 7.83 h)	79.1° 01:30	9.68	81%	66.2°
2035-10-13 Sat	96	—	unknown	01:30–06:00 (good, 4.5 h)	79.1° 01:30	9.73	89%	55.0°
2035-10-14 Sun	88	—	unknown	05:20–06:05 (good, 0.75 h)	79.1° 01:25	9.77	94%	44.0°
2035-10-15 Mon	49	—	unknown	20:15–06:05 (marginal, 9.83 h)	79.1° 01:20	9.81	98%	33.8°
2035-10-16 Tue	35	—	unknown	02:25–06:05 (marginal, 3.67 h)	79.1° 01:15	9.86	100%	26.0°
2035-10-17 Wed	37	—	unknown	20:10–00:15 (marginal, 4.08 h)	79.1° 01:10	9.9	99%	23.9°
2035-10-18 Thu	45	—	unknown	20:10–01:30 (marginal, 5.33 h)	79.1° 01:10	9.94	96%	28.9°
2035-10-19 Fri	84	—	unknown	20:10–20:40 (good, 0.5 h)	79.1° 01:05	9.98	90%	38.6°
2035-10-20 Sat	91	—	unknown	20:10–00:15 (good, 4.08 h)	79.1° 01:00	10.03	82%	50.4°
2035-10-21 Sun	97	—	unknown	20:05–03:55 (good, 7.83 h)	79.1° 00:55	10.07	72%	63.0°
2035-10-22 Mon	100	—	unknown	20:05–05:35 (good, 9.5 h)	79.1° 00:50	10.11	61%	75.8°
2035-10-23 Tue	100	—	unknown	20:05–06:05 (good, 10.0 h)	79.1° 00:50	10.15	50%	88.8°
2035-10-24 Wed	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.1° 00:45	10.19	38%	101.6°
2035-10-25 Thu	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.1° 00:40	10.23	28%	114.1°
2035-10-26 Fri	100	—	unknown	20:00–06:05 (good, 10.08 h)	79.1° 00:35	10.27	19%	126.1°
2035-10-27 Sat	100	—	unknown	20:00–05:05 (good, 10.08 h)	79.1° 00:35	10.31	11%	137.5°
2035-10-28 Sun	100	—	unknown	18:55–05:00 (good, 10.08 h)	79.1° 23:30	10.35	5%	147.3°
2035-10-29 Mon	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.1° 23:25	10.38	2%	154.4°
2035-10-30 Tue	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.1° 23:20	10.42	0%	156.1°
2035-10-31 Wed	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:15	10.46	1%	152.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-10-02&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.