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 V1057 Cyg: 11-01 (100), 11-02 (100), 11-03 (100), 11-04 (100), 11-05 (100) — by astronomy; check the weather when the night is within four days.

2043-11-01astronomy score per night — click a bar for that night2043-11-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2043-11-01 Sun	100	—	unknown	18:50–01:00 (good, 6.17 h)	87.2° 18:40	10.5	0%	108.1°
2043-11-02 Mon	100	—	unknown	18:50–00:55 (good, 6.08 h)	87.3° 18:35	10.53	1%	102.6°
2043-11-03 Tue	100	—	unknown	18:50–00:50 (good, 6.0 h)	87.3° 18:30	10.57	4%	96.8°
2043-11-04 Wed	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:25	10.6	8%	90.7°
2043-11-05 Thu	100	—	unknown	18:50–00:40 (good, 5.83 h)	87.2° 18:20	10.64	14%	84.6°
2043-11-06 Fri	100	—	unknown	18:45–00:40 (good, 5.92 h)	87.2° 18:20	10.67	22%	78.6°
2043-11-07 Sat	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.71	30%	73.0°
2043-11-08 Sun	93	—	unknown	18:45–00:30 (good, 5.75 h)	87.3° 18:10	10.74	39%	67.9°
2043-11-09 Mon	85	—	unknown	18:45–00:25 (good, 5.67 h)	87.2° 18:05	10.77	49%	63.6°
2043-11-10 Tue	75	—	unknown	18:45–00:00 (good, 5.25 h)	87.2° 18:05	10.8	59%	60.5°
2043-11-11 Wed	67	—	unknown	18:45–23:10 (good, 4.42 h)	87.3° 18:00	10.84	69%	58.9°
2043-11-12 Thu	55	—	unknown	18:40–20:45 (good, 2.08 h)	87.3° 17:55	10.87	79%	59.1°
2043-11-13 Fri	48	—	unknown	18:40–00:30 (marginal, 5.83 h)	87.3° 17:50	10.9	87%	61.4°
2043-11-14 Sat	45	—	unknown	18:40–00:15 (marginal, 5.58 h)	87.2° 17:45	10.93	94%	65.6°
2043-11-15 Sun	49	—	unknown	18:40–19:25 (good, 0.75 h)	87.2° 17:45	10.96	98%	71.4°
2043-11-16 Mon	58	—	unknown	18:40–20:45 (good, 2.08 h)	87.3° 17:40	10.98	100%	78.5°
2043-11-17 Tue	70	—	unknown	18:40–21:40 (good, 3.0 h)	87.3° 17:35	11.01	98%	86.2°
2043-11-18 Wed	82	—	unknown	18:40–22:45 (good, 4.08 h)	87.3° 17:30	11.04	94%	94.0°
2043-11-19 Thu	100	—	unknown	18:35–23:20 (good, 4.75 h)	87.2° 17:25	11.07	87%	101.6°
2043-11-20 Fri	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.2° 17:25	11.09	78%	108.4°
2043-11-21 Sat	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.3° 17:20	11.12	68%	114.0°
2043-11-22 Sun	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.3° 17:15	11.14	57%	118.1°
2043-11-23 Mon	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.16	46%	120.6°
2043-11-24 Tue	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.19	36%	121.3°
2043-11-25 Wed	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.3° 17:05	11.21	27%	120.4°
2043-11-26 Thu	100	—	unknown	18:35–23:20 (good, 4.75 h)	87.3° 17:00	11.23	19%	117.9°
2043-11-27 Fri	100	—	unknown	18:35–23:15 (good, 4.67 h)	87.3° 16:55	11.25	12%	114.1°
2043-11-28 Sat	100	—	unknown	18:35–23:10 (good, 4.58 h)	87.2° 16:50	11.27	6%	109.5°
2043-11-29 Sun	100	—	unknown	18:35–23:10 (good, 4.58 h)	87.2° 16:50	11.29	3%	104.1°
2043-11-30 Mon	100	—	unknown	18:35–23:05 (good, 4.5 h)	87.3° 16:45	11.31	1%	98.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2043-11-01&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.