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: 02-04 (86), 02-05 (82), 02-06 (81), 02-07 (78), 02-08 (76) — by astronomy; check the weather when the night is within four days.

2032-02-04astronomy score per night — click a bar for that night2032-03-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-02-12 Thu	65	—	unknown	19:25–22:00 (good, 2.58 h)	79.1° 16:30	10.38	4%	47.1°
2032-02-13 Fri	59	—	unknown	19:25–21:55 (good, 2.5 h)	79.1° 16:25	10.34	10%	34.3°
2032-02-14 Sat	49	—	unknown	19:30–21:45 (good, 2.25 h)	79.1° 16:20	10.3	18%	23.7°
2032-02-15 Sun	40	—	unknown	19:30–21:35 (good, 2.08 h)	79.1° 16:15	10.26	28%	18.5°
2032-02-16 Mon	31	—	unknown	19:30–21:20 (good, 1.83 h)	79.1° 16:10	10.22	38%	21.9°
2032-02-17 Tue	24	—	unknown	19:00–22:05 (marginal, 3.08 h)	79.1° 16:10	10.18	48%	30.7°
2032-02-18 Wed	19	—	unknown	19:35–21:55 (marginal, 2.33 h)	79.1° 16:05	10.14	58%	41.2°
2032-02-19 Thu	17	—	unknown	19:35–21:50 (marginal, 2.25 h)	79.1° 16:00	10.1	67%	52.2°
2032-02-20 Fri	17	—	unknown	19:35–21:45 (marginal, 2.17 h)	79.1° 15:55	10.06	76%	63.3°
2032-02-21 Sat	18	—	unknown	19:35–21:40 (marginal, 2.08 h)	79.1° 15:55	10.02	84%	74.5°
2032-02-22 Sun	20	—	unknown	19:35–19:40 (good, 0.08 h)	79.1° 15:50	9.98	90%	85.7°
2032-02-23 Mon	22	—	unknown	19:40–20:30 (good, 0.83 h)	79.1° 15:45	9.93	95%	97.0°
2032-02-24 Tue	26	—	unknown	19:40–20:50 (good, 1.17 h)	79.1° 15:40	9.89	98%	108.1°
2032-02-25 Wed	30	—	unknown	19:40–20:55 (good, 1.25 h)	79.1° 15:35	9.85	100%	119.3°
2032-02-26 Thu	29	—	unknown	19:40–20:55 (good, 1.25 h)	79.1° 15:35	9.8	100%	130.3°
2032-02-27 Fri	28	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:30	9.76	98%	141.1°
2032-02-28 Sat	31	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:25	9.71	94%	151.1°
2032-02-29 Sun	30	—	unknown	19:45–20:55 (good, 1.17 h)	79.1° 15:20	9.67	88%	158.9°
2032-03-01 Mon	29	—	unknown	19:45–20:50 (good, 1.08 h)	79.1° 15:15	9.62	81%	161.3°
2032-03-02 Tue	26	—	unknown	19:50–20:45 (good, 0.92 h)	79.1° 15:15	9.58	72%	156.1°
2032-03-03 Wed	25	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:10	9.53	62%	146.5°
2032-03-04 Thu	23	—	unknown	19:50–20:40 (good, 0.83 h)	79.1° 15:05	9.48	52%	135.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-04&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.