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: 02-11 (60), 02-12 (57), 02-13 (52), 02-14 (43), 02-15 (36) — by astronomy; check the weather when the night is within four days.

2032-02-11astronomy score per night — click a bar for that night2032-03-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-02-23 Mon	21	—	unknown	19:40–20:30 (good, 0.83 h)	89.6° 14:55	9.93	95%	101.9°
2032-02-24 Tue	23	—	unknown	19:40–20:40 (good, 1.0 h)	89.7° 14:50	9.89	98%	111.8°
2032-02-25 Wed	26	—	unknown	19:40–20:40 (good, 1.0 h)	89.7° 14:45	9.85	100%	121.4°
2032-02-26 Thu	25	—	unknown	19:40–20:40 (good, 1.0 h)	89.6° 14:40	9.8	100%	130.4°
2032-02-27 Fri	24	—	unknown	19:45–20:35 (good, 0.83 h)	89.5° 14:40	9.76	98%	138.5°
2032-02-28 Sat	26	—	unknown	19:45–20:35 (good, 0.83 h)	89.7° 14:35	9.71	94%	144.7°
2032-02-29 Sun	25	—	unknown	19:45–20:40 (good, 0.92 h)	89.8° 14:30	9.67	88%	147.8°
2032-03-01 Mon	24	—	unknown	19:45–20:35 (good, 0.83 h)	89.7° 14:25	9.62	81%	146.8°
2032-03-02 Tue	22	—	unknown	19:50–20:30 (good, 0.67 h)	89.5° 14:20	9.58	72%	141.8°
2032-03-03 Wed	20	—	unknown	19:50–20:25 (good, 0.58 h)	89.6° 14:20	9.53	62%	133.9°
2032-03-04 Thu	19	—	unknown	19:50–20:25 (good, 0.58 h)	89.7° 14:15	9.48	52%	124.1°
2032-03-05 Fri	17	—	unknown	19:50–20:20 (good, 0.5 h)	89.7° 14:10	9.44	40%	113.2°
2032-03-06 Sat	14	—	unknown	19:55–20:15 (good, 0.33 h)	89.6° 14:05	9.39	30%	101.4°
2032-03-07 Sun	13	—	unknown	19:55–20:10 (good, 0.25 h)	89.5° 14:05	9.34	20%	89.2°
2032-03-08 Mon	11	—	unknown	19:55–20:05 (good, 0.17 h)	89.6° 14:00	9.29	11%	76.7°
2032-03-09 Tue	10	—	unknown	19:55–20:05 (good, 0.17 h)	89.7° 13:55	9.25	5%	64.4°
2032-03-10 Wed	9	—	unknown	19:55–20:00 (good, 0.08 h)	89.7° 13:50	9.2	1%	52.7°
2032-03-11 Thu	7	—	unknown	20:00–20:30 (marginal, 0.5 h)	89.6° 13:45	9.15	0%	42.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-11&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.