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: 11-16 (100), 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100) — by astronomy; check the weather when the night is within four days.

2044-11-16astronomy score per night — click a bar for that night2044-12-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-11-16 Wed	100	—	unknown	18:40–23:55 (good, 5.25 h)	87.3° 17:35	11.01	8%	116.0°
2044-11-17 Thu	100	—	unknown	18:40–23:50 (good, 5.17 h)	87.2° 17:30	11.03	3%	110.8°
2044-11-18 Fri	100	—	unknown	18:35–23:50 (good, 5.25 h)	87.2° 17:30	11.06	1%	104.8°
2044-11-19 Sat	100	—	unknown	18:35–23:45 (good, 5.17 h)	87.3° 17:25	11.09	0%	98.4°
2044-11-20 Sun	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.3° 17:20	11.11	2%	91.8°
2044-11-21 Mon	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.14	5%	85.2°
2044-11-22 Tue	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.16	10%	78.8°
2044-11-23 Wed	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.18	16%	72.8°
2044-11-24 Thu	94	—	unknown	18:35–23:25 (good, 4.83 h)	87.3° 17:05	11.2	24%	67.5°
2044-11-25 Fri	88	—	unknown	18:35–23:20 (good, 4.75 h)	87.3° 17:00	11.23	32%	62.9°
2044-11-26 Sat	82	—	unknown	18:35–23:15 (good, 4.67 h)	87.2° 16:55	11.25	41%	59.5°
2044-11-27 Sun	71	—	unknown	18:35–22:50 (good, 4.25 h)	87.2° 16:55	11.27	51%	57.3°
2044-11-28 Mon	58	—	unknown	18:35–22:15 (good, 3.67 h)	87.3° 16:50	11.29	61%	56.9°
2044-11-29 Tue	48	—	unknown	18:35–20:10 (good, 1.58 h)	87.3° 16:45	11.31	70%	58.1°
2044-11-30 Wed	41	—	unknown	18:00–23:20 (marginal, 5.33 h)	87.3° 16:40	11.32	80%	61.3°
2044-12-01 Thu	38	—	unknown	18:35–23:10 (marginal, 4.58 h)	87.2° 16:35	11.34	88%	66.0°
2044-12-02 Fri	40	—	unknown	18:35–19:00 (good, 0.42 h)	87.2° 16:35	11.36	94%	72.3°
2044-12-03 Sat	45	—	unknown	18:35–19:45 (good, 1.17 h)	87.3° 16:30	11.37	98%	79.6°
2044-12-04 Sun	53	—	unknown	18:35–20:35 (good, 2.0 h)	87.3° 16:25	11.39	100%	87.5°
2044-12-05 Mon	64	—	unknown	18:35–21:35 (good, 3.0 h)	87.2° 16:20	11.4	98%	95.7°
2044-12-06 Tue	76	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 16:15	11.42	94%	103.6°
2044-12-07 Wed	96	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 16:15	11.43	88%	110.8°
2044-12-08 Thu	100	—	unknown	18:35–22:20 (good, 3.75 h)	87.3° 16:10	11.44	79%	116.8°
2044-12-09 Fri	100	—	unknown	18:35–22:20 (good, 3.75 h)	87.3° 16:05	11.45	68%	120.9°
2044-12-10 Sat	99	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.46	58%	123.1°
2044-12-11 Sun	98	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.47	47%	123.0°
2044-12-12 Mon	96	—	unknown	18:35–22:15 (good, 3.67 h)	87.3° 15:55	11.48	36%	120.9°
2044-12-13 Tue	95	—	unknown	18:35–22:10 (good, 3.58 h)	87.3° 15:50	11.48	26%	117.2°
2044-12-14 Wed	92	—	unknown	18:35–22:05 (good, 3.5 h)	87.3° 15:45	11.49	18%	112.2°
2044-12-15 Thu	90	—	unknown	18:35–22:00 (good, 3.42 h)	87.2° 15:40	11.49	11%	106.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-16&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.