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 Andromeda Galaxy: 01-30 (86), 01-29 (85), 01-31 (85), 02-01 (84), 02-02 (82) — by astronomy; check the weather when the night is within four days.

2032-01-24astronomy score per night — click a bar for that night2032-02-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-24 Sat	37	—	unknown	19:05–19:40 (good, 0.58 h)	89.6° 16:50	11.01	94%	74.3°
2032-01-25 Sun	45	—	unknown	19:05–20:35 (good, 1.5 h)	89.5° 16:50	10.99	98%	84.4°
2032-01-26 Mon	54	—	unknown	19:05–21:30 (good, 2.42 h)	89.7° 16:45	10.96	100%	94.5°
2032-01-27 Tue	64	—	unknown	19:10–22:20 (good, 3.17 h)	89.7° 16:40	10.93	100%	104.5°
2032-01-28 Wed	74	—	unknown	19:10–22:25 (good, 3.25 h)	89.7° 16:35	10.9	98%	114.3°
2032-01-29 Thu	85	—	unknown	19:10–22:30 (good, 3.33 h)	89.6° 16:30	10.87	95%	123.8°
2032-01-30 Fri	86	—	unknown	19:10–22:25 (good, 3.25 h)	89.5° 16:30	10.84	90%	132.6°
2032-01-31 Sat	85	—	unknown	19:15–22:25 (good, 3.17 h)	89.7° 16:25	10.8	83%	140.3°
2032-02-01 Sun	84	—	unknown	19:15–22:30 (good, 3.25 h)	89.8° 16:20	10.77	76%	145.9°
2032-02-02 Mon	82	—	unknown	19:15–22:25 (good, 3.17 h)	89.7° 16:15	10.74	66%	148.2°
2032-02-03 Tue	80	—	unknown	19:15–22:20 (good, 3.08 h)	89.5° 16:10	10.71	57%	146.2°
2032-02-04 Wed	77	—	unknown	19:15–22:15 (good, 3.0 h)	89.6° 16:10	10.67	46%	140.2°
2032-02-05 Thu	74	—	unknown	19:20–22:15 (good, 2.92 h)	89.7° 16:05	10.64	36%	131.5°
2032-02-06 Fri	72	—	unknown	19:20–22:10 (good, 2.83 h)	89.7° 16:00	10.6	25%	121.0°
2032-02-07 Sat	70	—	unknown	19:20–22:05 (good, 2.75 h)	89.6° 15:55	10.57	16%	109.3°
2032-02-08 Sun	68	—	unknown	19:20–22:00 (good, 2.67 h)	89.5° 15:55	10.53	8%	96.9°
2032-02-09 Mon	64	—	unknown	19:25–21:55 (good, 2.5 h)	89.6° 15:50	10.49	3%	84.0°
2032-02-10 Tue	62	—	unknown	19:25–21:55 (good, 2.5 h)	89.7° 15:45	10.46	0%	71.2°
2032-02-11 Wed	60	—	unknown	19:25–21:50 (good, 2.42 h)	89.7° 15:40	10.42	1%	58.8°
2032-02-12 Thu	57	—	unknown	19:25–21:45 (good, 2.33 h)	89.6° 15:35	10.38	4%	47.6°
2032-02-13 Fri	52	—	unknown	19:25–21:40 (good, 2.25 h)	89.5° 15:35	10.34	10%	38.4°
2032-02-14 Sat	43	—	unknown	19:30–21:30 (good, 2.0 h)	89.7° 15:30	10.3	18%	32.9°
2032-02-15 Sun	36	—	unknown	19:30–21:15 (good, 1.75 h)	89.8° 15:25	10.26	28%	32.3°
2032-02-16 Mon	29	—	unknown	19:30–21:05 (good, 1.58 h)	89.7° 15:20	10.22	38%	36.5°
2032-02-17 Tue	23	—	unknown	19:30–19:55 (good, 0.42 h)	89.5° 15:15	10.18	48%	43.8°
2032-02-18 Wed	19	—	unknown	19:35–21:50 (marginal, 2.25 h)	89.6° 15:15	10.14	58%	52.6°
2032-02-19 Thu	17	—	unknown	19:35–21:40 (marginal, 2.08 h)	89.7° 15:10	10.1	67%	62.1°
2032-02-20 Fri	17	—	unknown	19:35–21:35 (marginal, 2.0 h)	89.7° 15:05	10.06	76%	71.9°
2032-02-21 Sat	18	—	unknown	19:35–21:35 (marginal, 2.0 h)	89.6° 15:00	10.02	84%	81.9°
2032-02-22 Sun	19	—	unknown	19:35–19:55 (good, 0.33 h)	89.5° 15:00	9.98	90%	92.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-24&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.