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: 01-13 (100), 01-14 (100), 01-15 (98), 01-30 (92), 01-31 (92) — by astronomy; check the weather when the night is within four days.

2032-01-13astronomy score per night — click a bar for that night2032-02-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-13 Tue	100	—	unknown	18:55–00:00 (good, 5.08 h)	79.1° 18:25	11.28	2%	82.9°
2032-01-14 Wed	100	—	unknown	18:55–23:55 (good, 5.0 h)	79.1° 18:20	11.26	7%	68.6°
2032-01-15 Thu	98	—	unknown	18:55–23:50 (good, 4.92 h)	79.1° 18:20	11.23	14%	54.7°
2032-01-16 Fri	89	—	unknown	18:55–23:45 (good, 4.83 h)	79.1° 18:15	11.21	23%	41.5°
2032-01-17 Sat	80	—	unknown	19:00–23:40 (good, 4.67 h)	79.1° 18:10	11.19	33%	29.7°
2032-01-18 Sun	63	—	unknown	19:00–23:15 (good, 4.25 h)	79.1° 18:05	11.17	44%	20.8°
2032-01-19 Mon	46	—	unknown	19:40–20:55 (good, 1.25 h)	79.1° 18:00	11.14	55%	18.4°
2032-01-20 Tue	33	—	unknown	19:00–23:45 (marginal, 4.75 h)	79.1° 18:00	11.12	65%	23.9°
2032-01-21 Wed	25	—	unknown	19:00–23:30 (marginal, 4.5 h)	79.1° 17:55	11.09	74%	33.2°
2032-01-22 Thu	24	—	unknown	19:05–23:20 (marginal, 4.25 h)	79.1° 17:50	11.07	82%	43.9°
2032-01-23 Fri	27	—	unknown	19:05–23:15 (marginal, 4.17 h)	79.1° 17:45	11.04	89%	54.9°
2032-01-24 Sat	33	—	unknown	19:05–23:15 (marginal, 4.17 h)	79.1° 17:45	11.01	94%	66.1°
2032-01-25 Sun	42	—	unknown	19:05–20:20 (good, 1.25 h)	79.1° 17:40	10.99	98%	77.3°
2032-01-26 Mon	53	—	unknown	19:05–21:20 (good, 2.25 h)	79.1° 17:35	10.96	100%	88.6°
2032-01-27 Tue	64	—	unknown	19:10–22:25 (good, 3.25 h)	79.1° 17:30	10.93	100%	99.8°
2032-01-28 Wed	76	—	unknown	19:10–22:40 (good, 3.5 h)	79.1° 17:25	10.9	98%	111.0°
2032-01-29 Thu	91	—	unknown	19:10–22:45 (good, 3.58 h)	79.1° 17:25	10.87	95%	122.1°
2032-01-30 Fri	92	—	unknown	19:10–22:40 (good, 3.5 h)	79.1° 17:20	10.84	90%	133.1°
2032-01-31 Sat	92	—	unknown	19:15–22:40 (good, 3.42 h)	79.1° 17:15	10.8	83%	143.7°
2032-02-01 Sun	91	—	unknown	19:15–22:45 (good, 3.5 h)	79.1° 17:10	10.77	76%	153.4°
2032-02-02 Mon	90	—	unknown	19:15–22:40 (good, 3.42 h)	79.1° 17:05	10.74	66%	160.3°
2032-02-03 Tue	88	—	unknown	19:15–22:35 (good, 3.33 h)	79.1° 17:05	10.71	57%	160.9°
2032-02-04 Wed	86	—	unknown	19:15–22:30 (good, 3.25 h)	79.1° 17:00	10.67	46%	154.2°
2032-02-05 Thu	82	—	unknown	19:20–22:30 (good, 3.17 h)	79.1° 16:55	10.64	36%	143.6°
2032-02-06 Fri	81	—	unknown	19:20–22:25 (good, 3.08 h)	79.1° 16:50	10.6	25%	131.3°
2032-02-07 Sat	78	—	unknown	19:20–22:20 (good, 3.0 h)	79.1° 16:50	10.57	16%	118.0°
2032-02-08 Sun	76	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:45	10.53	8%	104.1°
2032-02-09 Mon	72	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:40	10.49	3%	89.8°
2032-02-10 Tue	70	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:35	10.46	0%	75.3°
2032-02-11 Wed	68	—	unknown	19:25–22:05 (good, 2.67 h)	79.1° 16:30	10.42	1%	61.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-13&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.