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: 02-01 (72), 02-02 (62), 02-13 (53), 02-14 (52), 02-15 (51) — by astronomy; check the weather when the night is within four days.

2036-02-01astronomy score per night — click a bar for that night2036-03-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-02-01 Fri	72	—	unknown	19:15–22:30 (good, 3.25 h)	89.8° 16:20	10.77	18%	43.6°
2036-02-02 Sat	62	—	unknown	19:15–22:15 (good, 3.0 h)	89.7° 16:15	10.74	26%	39.2°
2036-02-03 Sun	50	—	unknown	19:15–22:00 (good, 2.75 h)	89.5° 16:10	10.7	36%	38.0°
2036-02-04 Mon	39	—	unknown	19:15–21:40 (good, 2.42 h)	89.6° 16:10	10.67	46%	40.5°
2036-02-05 Tue	31	—	unknown	19:20–19:40 (good, 0.33 h)	89.8° 16:05	10.64	57%	46.3°
2036-02-06 Wed	26	—	unknown	19:20–22:30 (marginal, 3.17 h)	89.8° 16:00	10.6	68%	54.7°
2036-02-07 Thu	24	—	unknown	19:20–22:20 (marginal, 3.0 h)	89.6° 15:55	10.57	78%	64.7°
2036-02-08 Fri	26	—	unknown	19:20–22:20 (marginal, 3.0 h)	89.5° 15:55	10.53	87%	75.8°
2036-02-09 Sat	29	—	unknown	19:25–20:05 (good, 0.67 h)	89.7° 15:50	10.49	94%	87.5°
2036-02-10 Sun	36	—	unknown	19:25–21:05 (good, 1.67 h)	89.8° 15:45	10.46	98%	99.4°
2036-02-11 Mon	43	—	unknown	19:25–21:30 (good, 2.08 h)	89.7° 15:40	10.42	100%	111.0°
2036-02-12 Tue	48	—	unknown	19:25–21:35 (good, 2.17 h)	89.6° 15:35	10.38	98%	121.8°
2036-02-13 Wed	53	—	unknown	19:25–21:30 (good, 2.08 h)	89.6° 15:35	10.34	94%	131.2°
2036-02-14 Thu	52	—	unknown	19:30–21:30 (good, 2.0 h)	89.7° 15:30	10.3	88%	138.1°
2036-02-15 Fri	51	—	unknown	19:30–21:35 (good, 2.08 h)	89.8° 15:25	10.26	80%	141.7°
2036-02-16 Sat	50	—	unknown	19:30–21:30 (good, 2.0 h)	89.7° 15:20	10.22	70%	141.3°
2036-02-17 Sun	48	—	unknown	19:30–21:25 (good, 1.92 h)	89.5° 15:15	10.18	60%	137.5°
2036-02-18 Mon	45	—	unknown	19:35–21:20 (good, 1.75 h)	89.6° 15:15	10.14	50%	131.2°
2036-02-19 Tue	43	—	unknown	19:35–21:20 (good, 1.75 h)	89.8° 15:10	10.1	41%	123.6°
2036-02-20 Wed	41	—	unknown	19:35–21:15 (good, 1.67 h)	89.8° 15:05	10.06	32%	115.1°
2036-02-21 Thu	40	—	unknown	19:35–21:10 (good, 1.58 h)	89.6° 15:00	10.02	23%	106.2°
2036-02-22 Fri	38	—	unknown	19:35–21:05 (good, 1.5 h)	89.5° 15:00	9.97	16%	97.0°
2036-02-23 Sat	36	—	unknown	19:40–21:05 (good, 1.42 h)	89.7° 14:55	9.93	10%	87.7°
2036-02-24 Sun	33	—	unknown	19:40–21:00 (good, 1.33 h)	89.8° 14:50	9.89	5%	78.4°
2036-02-25 Mon	33	—	unknown	19:40–20:55 (good, 1.25 h)	89.7° 14:45	9.84	2%	69.2°
2036-02-26 Tue	31	—	unknown	19:40–20:50 (good, 1.17 h)	89.6° 14:40	9.8	0%	60.3°
2036-02-27 Wed	28	—	unknown	19:45–20:45 (good, 1.0 h)	89.6° 14:40	9.76	0%	52.1°
2036-02-28 Thu	27	—	unknown	19:45–20:45 (good, 1.0 h)	89.7° 14:35	9.71	3%	45.0°
2036-02-29 Fri	24	—	unknown	19:45–20:40 (good, 0.92 h)	89.8° 14:30	9.67	7%	40.0°
2036-03-01 Sat	21	—	unknown	19:45–20:30 (good, 0.75 h)	89.7° 14:25	9.62	14%	38.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-02-01&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.